On the 13th of this month I had unprotected sex, he did not cum in me. I started birth control on the 3rd of this month too. 1 hour after sec I took the morning after pill just to be safe. I am the in the third day of taking my sugar pills and am meant to get my period, however yesterday I got quite thick brown discharge and period symptoms (back pains, stomach ache).. is there any chance I could be pregnant or what does this mean?! Please help.