Is it risky/dangerous to keep having sex in the third trimester?

So I’m 32 weeks with twins and my husband and I are still having sex very regularly, it’s great, but I’m starting to get uncomfortable and sore down there. My pelvic bones ache and I hurt lol. Also when I orgasm I have weird crampy spasms in my lower back which I’ve never felt before until now. I’d like to keep having sex as usual as long as it’s not unsafe for some reason? 😐

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