sex during pregnancy😳 HELP!

mireya • 18 pregnant with my first by the loml😍👶🏾
I'm 11 weeks and 2 days. my boyfriend thinks that now that I'm pregnant we can have sex all the time whenever we want. and we might as well get all the sex we can possibly get before the baby comes. though I am okay with it.. my sex drive has decreased A LOT & I find myself not even wanting it at all. so when it does happen I try to get into it as much as he does in the heat of the moment but sometimes it is so difficult.. I am curious to know what positions to avoid as I get further into my pregnancy. I want to be as safe as possible and do no harm to the baby while we enjoy each other!