Please don’t judge

Hi, I had my baby right on my due date which it was January 13, 2021. I had sex with guy A on February 22-23rd and was on my last days of my period. ( I know some of you are going to judge) it was a one night stand with a guy I was talking to. Then on February 24 I went out and saw my ex and things happened. After that we didn’t stop taking and having sex. Idk why I went back if he had cheated. But I really was at my lowest at that time. On May 8th I found out I was pregnant but couldn’t believe if I was because the pregnancy test line was super faint. Then on the 16 I got a digital and it was a big pregnant positive. The first time I went to the doc was June 18 and they told me I was 10 weeks and due date was January 13. Idk if I should do a paternity test but I feel guilty. And I can’t stop thinking about it and feeling anxious. Could it be guy A the father. Baby looks nothing like dad but he looks like me. Plus he’s light and dad isn’t but I have light skin family. My mom is white skin. Please try to understand me
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So the weeks of pregnancy are dated from the first day of your last period. This means that in the first two weeks or so you aren't really pregnant. In those two weeks the body is preparing for ovulation. Because it's easier to pinpoint the start of your period, most doctors use the first day of your last period as the starting line of a pregnancy. That way, all pregnancies have kind of a standard timing.
If you have a 28 day cycle, you ovulate on day 14, which is the period you can get pregnant. You can't get pregnant in the first week of your cycle.