Terrified of sex!

I am so scared to have sex while pregnant.. Especially in the first trimester! My husband and Is best friends are due in a couple weeks and have gone the entire nine months with no sex whatsoever... I thought she was crazy but now that I'm pregnant I understand! I'm never in the mood and even the thought of having sex makes me nervous! Hubby says that may change in the second trimester but I see all these "rules" about having sex while pregnant and I don't think it's worth it! 😩 luckily I have a very understanding husband. Anyone else feeling like this?! We had a great sex life before the pregnancy and now it's no longer existent!