If he didn't finish in you then not sure how you think he could've gotten you pregnant?? I wouldn't stress about it I think it was obviously your ex.
I've been with my boyfriend for 4 years and we never used protection I never got pregnant until now. So it could be anyone regardless. DNA test is your best choice.
Sounds like you conceived around May 12. The guy before your previous period would not have gotten you pregnant, you had a period.
I'd say its the ex's but do a DNA test
Very unlikely you were ovulating the day your period started. And it's not about how much you sleep with someone, it's all about the timing. If you have regular cycles and ovulate regularly then it's almost certainly your ex's
Lol I'm having the same problem but I'm 30 weeks if you been sleeping with the same person and never got pregnant odds are it's the other persons
Sounds like your ex's. Get a DNA test to be sure.
It's probably your ex's but you can always get a dna test.
I'm 12 Weeks now and Tuesday I'll be 13weeks I've read in comments a girl had her last period may 3rd and is 11weeks will be 12 the same day I enter my new week she said she conseved may 14-20th and is due Feb 5th