I’m 15 weeks and 1 day pregnant today. I’m also young (18), so this wasn’t planned or expected. When my boyfriend’s parents found out, they asked for a paternity test. On my parents’ advice, I agreed to it. Even though I have nothing to hide, it still felt humiliating.
I do unterstand your feelings, the question implies that you Were involved with someone else than your boyfriend and its not nice to think about that in your situation especially since hormons make us more emotional during pregnancy (at least me).
As most people stated here already it is however a valid concern of your boyfriends parents. Cheating is very common, more common than I would have thought at 18! Doesn’t mean you’re a bad person.
Anyways I wanted to add a different perspective. The one of your child. If you don’t do the test, but your bf family has a tiny bit of doubt it might be that at some point in your child’s life it might hear about that doubt / just suspect it from behavior. And that can do unbelievable harm to a child. So its better to have that proof and then everyone can be happy about the new family member.