Pregnant?

Ok so me and my bf have been having unprotected sex a lot and here recently for the past few weeks my stomach hurts every morning and I'm a lil nauseas too. Every time I eat my stomach hurts or I get nauseas. I took a pregnancy test two days ago and it was negative,also my period usually lasts a full seven days but the past few months only last for about three or four days.I'm supposed to get my period in about seven days according to glow. Should I take another test around the time I'm supposed to get it or if I do get it but it's light go ahead and take one? Any opinions? Any comments are greatly appreciated!