Sunflower2018...
Were your results correct?
Hi, Sunflower. You had sex on November 12. You had a period on December 5. You had an ultrasound on January 8 where all that appeared was a yolk sac, indicating an embryo of about three weeks' development (which would be called about 5 weeks "GA"). You had an ultrasound January 30 that gave you a due date of September 2, and suggested conception at about December 10. You had an ultrasound in your nineteenth week that confirmed this again. You have written in on this community insisting that every single bit of this must be wrong, because you have the powerful counter-evidence of having read a bunch of crap on the Internet from women who are taking counsel of their fears. Your excuse for continually writing and asking for reassurance is that you say you are an "overthinker." You didn't bother to mention that you also got a test from the DDC, an oversight that makes me feel like I have been wasting my time attempting to help you confirm your medical information.
Nothing you have written suggests that the guy from before your last period (whose date is not confirmed by any medical info), is the dad. You refuse to intake that your fears sound groundless. You don't seem to even want to.
Guilt over drunken sex with the wrong guy is a powerful reason to feel bad, and as another woman on the site said, her therapist told her that in feeling stressed and guilty over an unwanted sexual event, this is her way to punish herself for it. But nothing anyone else can say will make you stop until you yourself decide to stop. A therapist or counselor might help you work through learning to accept that you made a mistake. Give it a try.