Still too early??

Heven
3rd month TTC with my husband. I'm pretty positive we didn't miss ovulation. I'm 2 days away from my period, and my boobs and ESPECIALLY my nipples are SOO SORE to the touch. I have to wear a bra because even my tshirt when I sleep is annoying to the touch. I usually get somewhat sore boobs before my period but never like this. I took at HPT this morning and BFN. Any experience with this? Maybe ladies who have had to wait a while after missed period to get your positive?