I just had sex with a guy and he thinks I’m on an iud but I’m on the pill and I feel like a pos

Answer to why I didn’t tell him: I just recently got out of a really abusive relationship and it’s hard for me to tell guys things. I’m scared of his reaction. And I know that I shouldn’t base him of my ex but I can’t bring myself to fully trust him

I never said it was wise or the right thing to do but I can’t undo it