Where is AF?

I'm 21 and TTC with my fiance for a couple months now. 8 to be exact. Back in March, I was three weeks late for my period. I had tender breast for 2 weeks, I was feeling sick to my stomach every morning, cravings and turn offs to certain foods as well. In those 3 long weeks of waiting for AF, I took 3 pregnancy tests and also had blood work done. BFN for the at home tests and a negative on blood test. My hormone levels were normal except for my Vitamin C. My vitamin C was really low and I was put on a prescription dose. I've had a history of ovarian cysts in the past and my OB/GYN suspects I could have a very mild case of PCOS. since March, my periods have been regular give or take a few days. No abnormal spotting, not extremely heavy or light.

I feel like I'm back in that disappointing nightmare. My fiance and I are really trying this month and I'm due for AF in 4 days. Every month, a week before AF comes to town, I get sore breasts and get very bloated. My symptoms now are fatigue, tiredness, nausea in the morning with no vomiting, sensitivity to smells-I feel like I can smell EVERYTHING, bloating, some cramping here and there and back pain. No tender breasts. I took a pregnancy test about 3 days ago and it was a BFN, but also taken in the afternoon.

Can anyone relate to the problem that I'm having? Or have any suggestions?