I had taken northeristone in November until we returned from on holiday and had my withdrawal bleed / period on 11th of december which lasted a week. We don’t have sex that often as I have endometriosis and it hurts! We had sex on the 10th of january day 31 of cycle the condom came off but we are not sure of it was before during or after sex. I took Ella one the morning after pill 48 hours later. We are now on day 50 of the same cycle no pregnancy symptoms ovary style ovulation pain about a week ago. A negative pregnancy test 15 days after sex. Worried that I may be pregnant plan to test again tomorrow which would be 3 weeks from sex. Have the pills just messed up my cycle?