Ok here's the deal.. Last time I had sexual intercourse was around the first week of Feb and I had my period in Feb but it was a few days late. I have spots on my stomach where it seems to be getting hard and I have been eating a lot lately. I have been having backaches also. I took 2 pregnancy tests and they both came back "not pregnant" the last one I took was March 7th but neither of them was taking with first morning urine.

People in my family sometimes have periods while their pregnant so I don't know if I'm pregnant or not.. How long should I wait before I take another one or should I even bother to take another one.

First of all, stomach getting "hard"... does not indicate pregnancy.

Take another hpt test, except... follow the instructions and take it in the morning.

Take another pregnancy test and follow the instructions carefully. Also... I agree with ISneezeFunny... your stomach getting "hard" does not indicate a pregnancy. Your stomach having hard spots could indicate constipation, gas bubbles, etc. If the third test comes back negative and you still have not gotten your period, make an appointment with your GYNO. Hope it all works out for you!