Ignore secondary symptom peak after end of temperature evaluation

lib/sympto/mucus.js

@@ -16,8 +16,6 @@ export default function (cycleDays, tempEvalEndIndex) {
     if (day.mucus.value !== currentBestQuality) continue
 
     // the three following days must be of lower quality
-    // AND no best quality day may occur until temperature evaluation has
-    // been completed
     const threeFollowingDays = mucusDays.slice(i + 1, i + 4)
     if (threeFollowingDays.length < 3) continue
 
@@ -27,6 +25,13 @@ export default function (cycleDays, tempEvalEndIndex) {
     if (bestQualityOccursIn3FollowingDays) continue
 
     const cycleDayIndex = cycleDays.indexOf(day)
+
+    // if temperature evaluation has been completed an we still haven't found
+    // a candidate, there is no cervix shift
+    if (cycleDayIndex > tempEvalEndIndex) return notDetected
+
+    // no best quality day may occur until temperature evaluation has
+    // been completed
     const relevantDays = cycleDays
       .slice(cycleDayIndex + 1, tempEvalEndIndex + 1)
       .filter(day => day.mucus && !day.mucus.exclude)