Do confused.

So my menstruals have always been irregular. I get a period every 6 mnths. Last month I had a period for 10 days. Then a wk later I was spotting. Now im feel like im going to start. I did a pregnancy test and it was negative but with a faint line. I feel like im pregnant though. Im constantly nauseous. Super tired. Have lots of heartburn which I've never had. Gassy and have diarrhea. My husband is having the same kind of symptoms. What could be going on with me. Should I wait a lil longer before I take another test?.