I am 13 an I have recently had protected sex with ma boyfriend. My period came but there was no blood just brown stuff! I am really worried normally ma periods are heavy and last a full 7 days but last time it was only 4-5 days! Should I go and see a doctor- what do you think could be wrong pleaseeeeeee helpp! I can't think about nethin but this! I'm losing sleep and focus in class pleas somebody hellpp! :confused: :( :eek: