Bleeding or normal?

My boyfriend and I just had sex!!! I'm 21 weeks and we haven't really been having sex, it literally felt like the first time it hurt! And I had to poop after so I went and there was like a drop of this pinkish brown mucus on the toilet seat idk how I got it there but I did. No red bleeding or anything like that. I put some tp in my undies cause I don't have a liner to see if anything else is going on down there but I'm scared :( Still feel baby move I think she may have just had hiccups!