I am pregnant.. who's the father?

[AliaMaria25]

I have been with my boyfriend for four years. We broke at the beginning of April for a couple weeks. I tried to sleep with someone else but he was too drunk to keep it hard and he didn't finish, we didn't use protection and it was the day after my period, April 13th. Me and my boyfriend have gotten back together and he has came inside me 5 times, twice around my fertile window and 4 days before ovulation (April 19th, 20th,22nd) according too my period tracker app ovulation occurred on April 26th. I am now pregnant but haven't had my dating scan. Doctor says I am most likely 4 weeks pregnant. Seems likely it is my boyfriends but I am having a hard time being happy because of the guilt and I cant stop worrying that it isn't his. According to the dates what do you guys think?
Thanks in advance!

[RockRose]

By the calendar,  yes,  it really looks like it's your boyfriends' baby.  This gets complicated in situations like this - if you've been having unprotected sex with your boyfriend for a long period of time (years) and don't get pregnant,  and then have sex with a new partner and then you DO get pregnant,  that tips the scales more toward the new guy.  

This looks like it's your boyfriend's baby,  unless you've been going years without getting pregnant.  Then it gets complicated.

[RockRose]

You will have a very good idea of who the dad is at your dating scan if you schedule it very soon.