Cramps all week and no period; pregnant?

Alright I've been trying to get pregnant for like the last year. But I haven't been ovulating at the right time so it's really hard for me. So i think we finally did it right this time and it worked but I don't know. Ok so if I am pregnant I would have concieved on May 2nd but my "period" came on May 16th but it was 2 days shorter than normal and it was really light...not normal at all...But anyways I'm on provera every month which is supposed to help my periods be on time. For the last month I have been so nauceous, bloated, cramping but with no bleeding, I've got sore nipples, been getting heartburn alot latley which I hardly ever get and all I want to do is sleep and also I've been getting diarreah alot latley. I went to the doctor on June 11th to talk with my doctor about my infertility and before I went to the doctor I took a pregnancy test but the test was defective and didn't work! But she gave me one at the doctor's office but it came out negative. That was on day 27 of my cycle. Now I am on day 34 and I really want to take another pregnancy test but I am so afraid it will be negative and I will be heart broken. So if anyone has any advice or a similar situation I would really appreciate it! Thanks