I'm hoping you can help me. 

I had unprotected sex on the 1st January. On the 12th January I had bleeding that was heavy that day. This came a week early as I  wasn't due until the 18th onward. On the 13th it got lighter and eventually stopped. I did a test on the 13th and it came back negative but I think all I got on it was blood. 

14th January all I've had all day is cramps. I'm going to do another test but unsure when. Could this be a sign I'm pregnant?