My boyfriend and I had sex unprotected sex the first three days after my period. I went to the hospital and did a blood test, it came up negative. Is there a chance I can be pregnant?

Always a chance when having sex, even protected.

There is a HUGE chance. Unfortunately most home pregnancy tests aren't really accurate until about 2 weeks after when you should have had your period so it is a nervous waiting game. Sorry about that, but that's life.

First why in god's name did you go to the hospital for a simple pregnancy test ? You go to a clinic or your doctor, The hospital will cost 3 or 4 times as much normally.

How soon after sex did you go to hospital for test, one day, one week, one month after sex /

Have you missed a period, you should not even be testing, till you have at least missed your period. ( two weeks late for home pregnancy tests)