In 36 weeks due December 13.....I had my period march 8 ended the 15th I had a
sex with my boyfriend the 17 th 18 th 19 th and 20th then I had sex with my ex bf April 1st both was unprotected sex who's most likly the father
Your boyfriend is the most likely father.
If your cycle is 28 days, you would probably have ovulated 22nd March. If it is 30 days, 24th March. So you were probably fertile between 17th & 24th. Sperm live in a woman's body for about 5 days.
Sex with your ex (why??!!) probably happened when implantation was occurring, fertilisation having already taken place.