weirdness

So my fiance and I have been trying this month to get pregnant..I stopped the pill last month and I'm 2 days late on my period I've taken 3 tests and all negative. I've had odd/inconsistent periods for years. I've been crampy bad like stabbing pain, boobs are tender, heartburn like crazy (but I don't have a gallbladder and forget my meds for heartburn 99% of the time lol). i have taken prenatal vitamins a lil during this time.. I just hate that PMS and pregnancy have such similar symptoms with it'd be opposites.. guess I'm posting cause just frustrated like I feel different than normal but nothing shows what's going on..we are only gonna try this month and be done till we get married next spring/summer..