Bleeding after sex??

So it's more like spotting I guess. It's pinkish too. Not to much. I wipe twice and it's gone. I haven't had sex with my husband for about a week or so because I had a procedure done that I couldn't for so long , then we were trying to avoid my ovulation time (which sucks). From what all my apps say I should have ovulated between the 3rd and the 5th. All different apps say different days.

So why would I be spotting ? I'm getting a polyp removed soon.. could that be the cause of the spotting?