Hi, I am 18. My boyfriend and I had intercourse on March 14th. My period came 10 days later but it was lighter than normal. It lasted for it s usual time though. I m still going through the later stages of puberty as well. However, I masturbated yesturday and started bleeding . I might ve been slightly rough, but I m not entirely sure. Then I masturbated again today and it was a brownish color. What is the possibility that I m pregnant? I m also a little low on water as well, which my boyfriend is saying might be the issue. No, we have not had intercourse since that day in March.