Need advice no bad comments please.....

Jackie
Good evening ladies! I had sex with my partner on June the 13th. He didn't put a condom and he almost finish inside of me but he pull out very fast for 5 seconds then put it inside of me again. I was late on my period for 5 days. So, I've been concerned and kinda wondering if I'm starting my period or is it implantation bleeding... Yesterday I had few mild cramps and when I clean myself its just brown. And right now its still brown with no blood in it. Could it be my period or implantation ?