My husband and I had unprotected sex while my period was down its been about 4weeks now I got my period 5days early very light bleeding with cramps it only last 3days my period be very havey a week before this I took a test n it was negative I also became very nausea this morning... is it possible for me to be pregnant

It's possible, but your period may have just been off as well. Since it was a week ago that you tested, try another test. Be sure to follow the directions carefully. If negative, see what happens with your next period. You could certainly see your doctor as well if you are still uncertain.