Shorten pre-ovu phase when early mucus

lib/sympto/pre-ovulatory.js

@@ -5,13 +5,20 @@ export default function(cycle) {
   const fiveDayEndDate = startDate.plusDays(4).toString()
   const fiveDayRuleDays = cycle.slice(0, 5).filter(d => d.date <= fiveDayEndDate)
   const preOvulatoryDays = getDaysUntilFertileMucus(fiveDayRuleDays)
+  let endDate
+  if (preOvulatoryDays.length === fiveDayRuleDays.length) {
+    endDate = fiveDayEndDate
+  } else {
+    endDate = preOvulatoryDays[preOvulatoryDays.length - 1].date
+  }
+
   return {
     cycleDays: preOvulatoryDays,
     start: {
       date: preOvulatoryDays[0].date
     },
     end: {
-      date: fiveDayEndDate
+      date: endDate
     }
   }
 }