Confused!!!!!

I've been trying to get pregnant for awhile now me and my fiancee has been on and off for 8 years I've had 8 miscarriage with a different guy (not my fiancee) we had sexual intercourse and I've been having stomache pains and cramps for the past four days. I've never been able to carry past 8 weeks. Could I be pregnant or not. My period not for another 12 days but I've always had irregular periods. I took one test allready came back negative did I take it too early or am I just not pregnant.