My boyfriend and I had unprotected sex about 3 weeks ago on my pierod... it usually lasts 5 days, but only lasted 3. About a week later I was getting cramps, breats were really sensitive, and I've been really tired. I've took a home pg test and it came back neg. Now I'm bleeding and still getting cramps... I went to the doctor today and they took a pg test and it came out neg. Is there a chance I could be or am pregnant? Why am I bleeding again?