Pain with sex?

I’m 35 weeks pregnant and I tried to have sex with my husband after not wanting it for a few weeks, but for some reason it hurt. I was lubed up and we even tried a few different positions, but it still hurt to the point where we had to stop. Has anyone else experienced this or have any advice? I have an appointment for the 11th and will talk to my doctor about it then. But in the meantime, I’m just curious if anyone else has been through this and what helped them.