I'm glad you're feeling a little reassured!
it's so very very common not to find out you're pregnant early on, despite many testing while the sheets are still warm!! Most women drink at sometime before finding out. A one off & bladdered every weekend are two different things, and even do it's highly unlikely to cause an issue unless there's an element of alcohol dependency.
That aside, you really really need to think very carefully about your 'D'P. He wants you to have a termination. Either he's looking for any excuse as he doesn't want a baby (at least not right now) or he's incredibly cruel or incredibly stupid. If he was genuinely worried about this, cared about YOU & wanted the baby, he'd had done some research & even if he had found some worrying information discussed it gently with you, not said what he did, the way he did. I know it's hard to hear, but he's not one of the good ones.
I'm assuming there must be some truth in what DP is saying otherwise he wouldn't be saying it?
I'm sure you'd have said if he was a Dr??
Think about why a bloke, who isn't a specialist in this field would say this. Then think about why the hell you're with someone so unkind, stupid & nasty.
Also think about what he wants you to do & why. I feel he wants a termination anyway, but let's give him the benefit of the doubt for 5 minutes. He wants you to terminate a foetus that he (supposedly) thinks might be 'less intelligent'. How do you think he's going to be as a long term partner & Dad if your child does have any (unrelated to this) issues?? Or if you do??? He doesn't exactly sound like he will be there for you, does he?!?!
Go to your Mums tonight, but don't be surprised if she sides with him. Unfortunately a lot of our nearest & dearest just want us to be in relationships whether they are good for us or not.
think carefully!
congratulations on your baby!! 🌸😍