I had unprotected sex by accident ONCE about 3 weeks ago. He did not precum or cum inside me. Then I had my period as normal, for six days. It was bright red, heavy, etc. Then it stopped completely and I thought it was over, but today I wiped and it came up spotty/red. Could I be pregnant? FYI: I have polycystic ovarian syndrome and I take birth control. Plus I have been extremely stressed the past few days (getting up early/staying up late with homework).