Bleeding after sex? Or IB? 😫

Hey ladies! Sorry for any TMI here, but I'm really confused! I had a little bit of pink discharge that unnoticed when I wiped immediately after sex (not rough) and thought nothing of it. I then spotted light pink on and off and some brown for two days and have really been feeling unwell. All the symptoms of PMS (or early pregnancy) since then. That was Thursday night and the sporting was completely over on Sunday. I took a test today (not FMU) and i thought I kind of saw something but it's pretty negative. AF is due on Saturday, so it's still early. My question is, how long have some of you ladies bled after non-rough sex? I have had pink dishcharge before but have never spotted for days, but I don't want to get worked up over some normal bleeding from sex!