Is it possible?

My boyfriend "came" in me on one of my fertile days. My period wasn't supposed to come for until 2 weeks after my fertile week. It came 3 days afterwards, my period is normally a week and a half long. It was only 2 days. My breast have been sore, extremely bad back pain, and my feet are swelling. I took a test, it was negative. I never trust the home test though. A day before I found out I was pregnant with my daughter a home test said negative. I had a blood test and it was positive. But that was 3 yrs ago. Help me please? Sorry that it's so long.