I had a period dec 7th next period jan 11 i was 1 week late which for that month i had a 35 day cycle.... The app says i ovulated jan 25th under a 28 day cycle but since for that month it was a 35 day cycle says ovulation occured on jan 31st... Which date do i go by if this makes any sense to you... Either im 12dpo or 6dpo im super confused....negative pregnancy tests so far