I am now 2 days late on my period. My boyfriend and I had sex today, afterwords I started bleeding, but as soon as I wiped it away it stopped. I have twingy cramps that come and go, like i'm getting ready to start my period, but nothing. I am never late on my periods, my periods are very regular. I took a pregnancy test today it came back negative. Is it to early to tell still? Could I be pregnant?