diff --git a/js/medicine/surgery/addGenitals/addOvaries.js b/js/medicine/surgery/addGenitals/addOvaries.js
index 65ed27678548d3151cd6cc6e6b4b1c18fc380c13..4432b54dd5e12b50ce7734415c70e176a124b258 100644
--- a/js/medicine/surgery/addGenitals/addOvaries.js
+++ b/js/medicine/surgery/addGenitals/addOvaries.js
@@ -97,6 +97,9 @@ App.Medicine.Surgery.Procedures.OFAddOvaries = class extends App.Medicine.Surger
 				this._slave.pubertyXX = 1;
 			}
 		}
+		if (V.menstruation === 1) {
+			this._slave.fertPeak = 1;
+		}
 
 		if (this.eggType === "human") {
 			return this._assemble(new App.Medicine.Surgery.Reactions.AddOvaries());
@@ -147,6 +150,9 @@ App.Medicine.Surgery.Procedures.OFReplaceOvaries = class extends App.Medicine.Su
 				this._slave.pubertyXX = 1;
 			}
 		}
+		if (V.menstruation === 1) {
+			this._slave.fertPeak = 1;
+		}
 
 		if (this.eggType === "human") {
 			return this._assemble(new App.Medicine.Surgery.Reactions.AddOvaries());
diff --git a/js/medicine/surgery/addGenitals/asexualReproOvaries.js b/js/medicine/surgery/addGenitals/asexualReproOvaries.js
index 737aa95b212f53817f2ec5a71121cce8048645bb..5b2b1135037263969d5b00f05396314048f1c3d3 100644
--- a/js/medicine/surgery/addGenitals/asexualReproOvaries.js
+++ b/js/medicine/surgery/addGenitals/asexualReproOvaries.js
@@ -57,6 +57,9 @@ App.Medicine.Surgery.Procedures.OFAsexualReproOvaries = class extends App.Medici
 	apply(cheat) {
 		if (this._slave.preg < -1) {
 			this._slave.preg = 0;
+			if (V.menstruation === 1) {
+				this._slave.fertPeak = 1;
+			}
 		}
 		this._slave.eggType = "human";
 		this._slave.pregData = _.cloneDeep(App.Data.misc.pregData.human);
diff --git a/js/medicine/surgery/addGenitals/freshOvaries.js b/js/medicine/surgery/addGenitals/freshOvaries.js
index ec557c0c7960e5f6051413af762ec6d09bc47809..8c9d34ef003814a9dc2d64515e2af495610dc5bb 100644
--- a/js/medicine/surgery/addGenitals/freshOvaries.js
+++ b/js/medicine/surgery/addGenitals/freshOvaries.js
@@ -50,6 +50,9 @@ App.Medicine.Surgery.Procedures.OFFreshOvaries = class extends App.Medicine.Surg
 				this._slave.pubertyXX = 1;
 			}
 		}
+		if (V.menstruation === 1) {
+			this._slave.fertPeak = 1;
+		}
 		return this._assemble(new App.Medicine.Surgery.Reactions.FreshOvaries());
 	}
 };
diff --git a/js/medicine/surgery/addGenitals/immortalOvaries.js b/js/medicine/surgery/addGenitals/immortalOvaries.js
index b62335ba319939af30bc168bacaa8bd4126284af..3fbeb98b7cfcffb1b34e3ee654d1546beeb15f55 100644
--- a/js/medicine/surgery/addGenitals/immortalOvaries.js
+++ b/js/medicine/surgery/addGenitals/immortalOvaries.js
@@ -57,6 +57,9 @@ App.Medicine.Surgery.Procedures.OFImmortalOvaries = class extends App.Medicine.S
 				this._slave.pubertyXX = 1;
 			}
 		}
+		if (V.menstruation === 1) {
+			this._slave.fertPeak = 1;
+		}
 		return this._assemble(new App.Medicine.Surgery.Reactions.ImmortalOvaries());
 	}
 };
diff --git a/js/medicine/surgery/addGenitals/mpreg.js b/js/medicine/surgery/addGenitals/mpreg.js
index a70a347e2594ef06d20704fbdda036719fa753a4..adcb211ce1e95e1dfff842e19e3eb3ba53042f28 100644
--- a/js/medicine/surgery/addGenitals/mpreg.js
+++ b/js/medicine/surgery/addGenitals/mpreg.js
@@ -66,6 +66,9 @@ App.Medicine.Surgery.Procedures.OFAddMPreg = class extends App.Medicine.Surgery.
 				this._slave.pubertyXX = 1;
 			}
 		}
+		if (V.menstruation === 1) {
+			this._slave.fertPeak = 1;
+		}
 		return this._assemble(new App.Medicine.Surgery.Reactions.AddMPreg());
 	}
 };
diff --git a/js/medicine/surgery/genitals/mpregRemoved.js b/js/medicine/surgery/genitals/mpregRemoved.js
index 319dbf22562f114b3d037fb755240856538df8ce..d5416c61319452397eacd4e3c9ea8721494fd9ed 100644
--- a/js/medicine/surgery/genitals/mpregRemoved.js
+++ b/js/medicine/surgery/genitals/mpregRemoved.js
@@ -24,6 +24,9 @@ App.Medicine.Surgery.Procedures.RemoveMPreg = class extends App.Medicine.Surgery
 		this._slave.mpreg = 0;
 		this._slave.ovaImplant = OvaryImplantType.NONE;
 		this._slave.wombImplant = "none";
+		if (V.menstruation === 1) {
+			this._slave.fertPeak = 1;
+		}
 		return this._assemble(new App.Medicine.Surgery.Reactions.MPregRemoved());
 	}
 };
diff --git a/js/medicine/surgery/genitals/preg.js b/js/medicine/surgery/genitals/preg.js
index a1c108538d277a12247a8affe8a9699ed2f6718b..078a1132dd3498fefc81a972afb7e16cfaa83bda 100644
--- a/js/medicine/surgery/genitals/preg.js
+++ b/js/medicine/surgery/genitals/preg.js
@@ -77,6 +77,9 @@ App.Medicine.Surgery.Procedures.ImplantPregGenerator = class extends App.Medicin
 		this._slave.broodmother = 1;
 		this._slave.broodmotherFetuses = 1;
 		this._slave.pregControl = "none";
+		if (V.menstruation === 1) {
+			this._slave.fertPeak = 0;
+		}
 		return this._assemble(new App.Medicine.Surgery.Reactions.Preg());
 	}
 };
diff --git a/js/medicine/surgery/genitals/pregRemove.js b/js/medicine/surgery/genitals/pregRemove.js
index 8ed5c2e3f4579aab49ceddeb90ea69f8bdb7b8a8..ad56e6259e9f74ca30b37534c0a87ee2d56da2d7 100644
--- a/js/medicine/surgery/genitals/pregRemove.js
+++ b/js/medicine/surgery/genitals/pregRemove.js
@@ -47,6 +47,9 @@ App.Medicine.Surgery.Procedures.RemovePregGenerator = class extends App.Medicine
 		this._slave.broodmotherFetuses = 0;
 		this._slave.broodmotherOnHold = 0;
 		this._slave.pregControl = "none";
+		if (V.menstruation === 1) {
+			this._slave.fertPeak = 1;
+		}
 		return this._assemble(new App.Medicine.Surgery.Reactions.PregRemove());
 	}
 };
diff --git a/src/facilities/surgery/surgeryPassageLower.js b/src/facilities/surgery/surgeryPassageLower.js
index 1ff5e3e4cb8f5a7cb8a3a08fcf56d9217e5bb477..4926fe32a8f23281e12916f8d335cdf466970ba7 100644
--- a/src/facilities/surgery/surgeryPassageLower.js
+++ b/src/facilities/surgery/surgeryPassageLower.js
@@ -387,7 +387,7 @@ App.UI.surgeryPassageLower = function(slave, refresh, cheat = false) {
 						App.UI.DOM.appendNewElement("div", el, `${His} indenture forbids elective surgery`, ["choices", "note"]);
 					} else if (slave.breedingMark === 1 && V.propOutcome === 1 && V.eugenicsFullControl !== 1 && FutureSocieties.isActive('FSRestart')) {
 						App.UI.DOM.appendNewElement("div", el, `${He} is protected from extreme surgery`, ["choices", "note"]);
-					} else if (isFertile(slave) && slave.ovaryAge <= 46) {
+					} else if (isFertile(slave, true) && slave.ovaryAge <= 46) {
 						r.push(`${He} could be made into a broodmother.`);
 						linkArray.push(App.Medicine.Surgery.makeLink(
 							new App.Medicine.Surgery.Procedures.ImplantPregGenerator(slave),
diff --git a/src/js/statsChecker/statsChecker.js b/src/js/statsChecker/statsChecker.js
index 78f31773730837891c49907bbbd02ef0aa570a95..f72785b623f094b33dfdb096aad20b5f6094165c 100644
--- a/src/js/statsChecker/statsChecker.js
+++ b/src/js/statsChecker/statsChecker.js
@@ -600,11 +600,13 @@ globalThis.canGetPregnant = function(slave) {
 	return false;
 };
 
-/** contraceptives (.preg === -1) do not negate this function
+/**
+ * contraceptives (.preg === -1) do not negate this function
  * @param {FC.HumanState} slave
+ * @param {boolean} ignoreCycle ignoreCycle=true will not take into account menstruation
  * @returns {boolean}
  */
-globalThis.isFertile = function(slave) {
+globalThis.isFertile = function(slave, ignoreCycle=false) {
 	if (!slave) {
 		return null;
 	}
@@ -636,7 +638,7 @@ globalThis.isFertile = function(slave) {
 			}
 		}
 		// Menstruation route.
-		if (V.menstruation === 1 && slave.fertPeak > 0 ) {
+		if (!ignoreCycle && V.menstruation === 1 && slave.fertPeak > 0 ) {
 			return false;
 		}
 		return true;
diff --git a/src/npc/surgery/surgery.js b/src/npc/surgery/surgery.js
index 5f6e3966780701f838a6d53688fb03782978f196..29ea21f03c3f97e8cb86415c9b27a6c844279670 100644
--- a/src/npc/surgery/surgery.js
+++ b/src/npc/surgery/surgery.js
@@ -561,7 +561,10 @@ globalThis.surgeryAmp = function(slave, part, cheat = false) {
 			}
 			if (slave.drugs === "clitoris enhancement" || slave.drugs === "intensive clitoris enhancement") {
 				slave.drugs = "no drugs";
-			}			
+			}
+			if (V.menstruation === 1) {
+				this._slave.fertPeak = 1;
+			}
 			surgeryDamage(slave, 20, cheat);
 			break;
 		case "voicebox":
diff --git a/src/player/electiveSurgery.js b/src/player/electiveSurgery.js
index 731891d40dbfef53e05866b4f189467c2229a84f..5e9627d4ea006f50dd8d65932cee3b2b589d398b 100644
--- a/src/player/electiveSurgery.js
+++ b/src/player/electiveSurgery.js
@@ -3174,6 +3174,9 @@ App.UI.electiveSurgery = function() {
 			V.PC.preg = 0;
 			V.PC.ovaImplant = 0;
 			V.PC.wombImplant = "none";
+			if (V.menstruation === 1) {
+				this._slave.fertPeak = 1;
+			}
 			cashX(forceNeg(50000), "PCmedical");
 		})));
 		return el;
@@ -3190,6 +3193,9 @@ App.UI.electiveSurgery = function() {
 		el.append(App.UI.DOM.makeElement("div", surgeryLink("Fix your fertility concerns", "replaceOvaries", () => {
 			healthDamage(V.PC, 10);
 			V.PC.preg = 0;
+			if (V.menstruation === 1) {
+				this._slave.fertPeak = 1;
+			}
 			cashX(forceNeg(applyDiscount(500)), "PCmedical");
 		})));
 		return el;
@@ -3213,6 +3219,9 @@ App.UI.electiveSurgery = function() {
 				V.PC.eggType = "human";
 				V.PC.ovaImplant = 0;
 				V.PC.wombImplant = "none";
+				if (V.menstruation === 1) {
+					this._slave.fertPeak = 1;
+				}
 				cashX(forceNeg(50000), "PCmedical");
 			})));
 		}
@@ -3233,6 +3242,9 @@ App.UI.electiveSurgery = function() {
 			V.PC.ovaries = 1;
 			V.PC.preg = 0;
 			V.PC.eggType = "human";
+			if (V.menstruation === 1) {
+				V.PC.fertPeak = 1;
+			}
 			cashX(forceNeg(50000), "PCmedical");
 		}));
 		el.append(App.UI.DOM.makeElement("div", App.UI.DOM.generateLinksStrip(linkArray)));