I have an odd question.. sex and pregnancy

So I’m currently 13wks and my husband and I had sex for the first time in like a month (I wasn’t feeling good and I had a cold and blah blah blah lol) he is on the larger side and it felt weird.. I was on my back if that makes a difference...the only way I can try to explain it is it felt like I had a balloon/ball in my lower pelvis/stomach and it was a kinda bulging sensation like it was being pushed up ward... it didn’t hurt but it was an odd feeling and I didn’t like it one bit. I hope that makes sense...

Is this normal? Is it just like my uterus and what not moving around in there? Or should I be concerned.

Has anyone else experienced this?