TMI blood

So I'm a little worried but I don't wanna run to the hospital and it be nothing.

I had absolute mind blowing sex with my guy and well after I wiped myself because I was soaked and wanted to be comfortable laying down. The napkin came back pink. I did it 3 times and all pink. I feel like my stomach is completely solid with pressure but no cramps and no more pink. Well for now at least that I know of and I'm 36 weeks pregnant.

HAS THIS HAPPENED TO ANYONE ELSE?