HELP. Symptoms but negative test?

I’m tired... like very tired. I eat all the time, and have weird cravings for food I don’t really eat. My tummy hurts, and sometimes I get a few cramps here and there. I am even gassy and that’s not normal for me. My period is due on Monday, and I’ve taken two tests that both say negative.

Could I still be pregnant?

I need help.