Ladies please help! Sex topic

Every time me and my SO have sex it hurts afterwards. Like it burns. I'm 13 weeks pregnant and idk of its because I'm pregnant but it's not pleasant. He cums inside me everytime. I'm allergic to latex and there's no point to pull out. Is it just the friction and the cum mixed together that makes it a bad mix? It hurts sooo bad it makes me cry sometimes and I don't want to have sex for a long time but he wants to go again. Ugh it sucks so bad. And not to mention I can't sit after it.