Should I be embarrassed?

I lost my virginity to my current boyfriend, and we've only been sexually active for about two months. Last weekend he came over when my parents weren't home and his parents found out because my mom posted something on Facebook about where they were. They weren't mad at all but his dad did talk to him about being careful and all of that. But I was so embarrassed that they now know we have sex (and my parents don't). I feel like his parents will like me less now even though he swears they don't. I'm nervous about the next time I see them being awkward too. Should I be embarrassed or am I overreacting?