Sore breasts, feel sick, BFN?

Nala
I had a miscarriage and D and C in March and since then my cycles have been totally screwed up or nonexistent so it's hard for me to know if I tested too early but based on last moth's cycle (which was longer than usual but "normal"), Glow says I should hold off testing until the 16th. But I feel so sick right now (sore breasts, constipated, nausea that comes and goes, moody, and around ovulation week I felt a ton of cramping) that I figured it would be positive for sure but this am it was BFN. :/
Should I be worried?? Like should I see my GYN? I'm just hoping this IS pregnancy because if this is normal I wanna die. x.x Uhg!