Pregnant and ocd. Please help!!

[Lyndz123]

I've been on before about my fears a few months into my pregnancy. After my dating scan i started doubting that my husband is my babys father even thought i cant remember cheating. And i know i would remember something like that even drunk. Our baby meausured from the 27th april and i counted 2 week after that which would have been when we conceived which was our wedding day. I know we never had sex that night as we were pretty drunk. Now i've got it in my head that i went off and had sex with someone and cant remember because i was so drunk. I know if i had done something as bad as cheating i would remember and i would be devastated. I also know that everyone doesnt ovulate exactly 2 weeks later. We had sex the day after and a few days after that so we probably conceived then but i cant get it out of my head that i must have cheated. It's making me feel so guilty. I love my husband so much and dont want to lose him. I need these thoughts to stop!!