Yes, hormones are so intertwined with pregnancy that lots of things happen from too much discharge to not enough during sex, etc. I never had the issue you spoke of, I always had brown spotting after sex. :>(( Even though I knew it was normal, I would freak each and every time. I always worried. I had the increased libido going but with that as well so it wasn't a great thing. good luck
Yea very normal your hormone levela have changed drastically so its super common