Bleeding after sex 5dpo

Okay I am 5dpo with no symptoms at all. This morning my SO and I dtd and when I went to clean up in the bathroom I noticed the toilet paper was light pink. Could this be implantation bleeding or just me bleeding due to being sensitive down there? By the way it was not very rough at all and it was a quicky since he had to leave for work shortly after, if that matters! Help please this is our second month trying and our daughter turns 5 on the 25th really hoping for my bfp this month so I can surprise my daughter on her bday!!