Bleeding after sex?

What would cause bleeding/blood tinged cervical mucus after sex? I have an appointment with my doctor but it’s not for another 3 weeks as he’s very booked up 🤦🏼‍♀️.

I’ve never had this happen before. I’ve noticed it the last few times my husband and I have had sex. We’re well lubed up, sex doesn’t hurt or feel uncomfortable, and it’s not just before or just after my period. Like I said, I’ve never had this happen before. Any insight of what it could be?