The Father.. please help

I’m really not even sure how to start this post, but my anxiety has brought me here, so here it is:

My boyfriend (MAN A) and I broke up in April. During this time, I dated another guy(MAN B) until he and I broke up June 20th, 2021. While he and I were together, I took many Plan B’s, and I guess this resulted in terrible off and on spotting from June 7th, to June 19th. June 20th, I started what I think was my actual period. I was bleeding so bad, that I actually went to the ER on June 24th. They conducted a pregnancy test, negative. Now, the last time I actually saw ex boyfriend was for one day between June 16th & June 19th. (I know it was only one day I saw him, but I’m not sure what date it was) I’m not sure if we even had sex because I was bleeding so much, I don’t think we did, but I’m really not sure. Anyways, my “period” ended on June 25th. Current boyfriend (babydaddy) and I got back together June 21st. My ovulation window was between July 1st and July 6th. We had unprotected sex and he came inside of me July 3rd. So I would give a 2 week difference between MAYBE being intimate with MAN B and definitely being intimate with MAN A, my boyfriend. I tested for pregnancy almost daily and finally on July 20th, I got a very VERY faint positive line.

First Ultrasound pic was taken 8w5D.

Second Ultrasound and I was 11w5D. Baby measured at 4.8cm. Doctor confirmed my due date to be March 27th, FLP June 20th, so everything matches up. Measurements, dates. Wouldn’t baby have been waaay more developed in the first ultrasound if babydaddy was MAN B instead of MAN A? I’m 99.99% sure MAN A is the father. My anxiety is just messing with my head and emotions and I’m just looking for some reassurance. Sorry for the word vomit, I feel wrong, and ashamed, and just need an opinion. TIA.