Hello! I am 19 and have a regular period, I had sex unprotected during my most fertile days and 11 days later (the time around my period starts) I noticed that i had light brown blood. This has never happened before usually its bright red and very heavy, I also usually get substantial amounts of pain but I have been having mild-light cramps. I didnt think much of it but when I checked my pant liner later there was only a small amount and it was a light pink/ brown color. I went to bed and this morning I woke up and there was a bit more but nothing like my usual period and it was a dark red colour