i am almost 17y/o. i was supposed to start my period a few days ago(Dec. 29/30,about 2-3 days after i had protected sex) but instead of it being like normal blood like usual, it was a dark brown color. so i figured it was just old blood and that it would be normal in a day or so, but it hasn't stopped being really dark brown and thick(clumpy and mucus like). 1 day (about 2 days ago) it was like normal for a little while, (heavy and red) but now its back to brown and its not even continuous, its kind of random. and im just really worried because this is the first time its ever done any thing like this. i was thinking for a little bit that it was because of my getting over a the flu but now idk. someone please help.