I came off the pill in June this year. My periods came back straight away and I have had them regular ever since 25/26days. My last started on 6th October really light and then was really really heavy for 5 days before finishing on the 10th. According to my app my fertile window was from 15- 20th October. I had sex 17,18,19,20. I also tried to do ovulation tests from the 15th but these all came back negative. Is is possible that the app got my fertile window wrong and I could have been fertile from 10-15th October ie straight after my period? I know there is something where you don’t ovulate but I have really regular bleeds so presume I am. Can anyone help? X