Af or no?

Af was due today has yet to show but yesterday when i put my bra on about an hour later they started feeling sore.. Like muscle pain kind of... Took it off last night and the pain stopped. I noticed theyre swollen.. Bigger than usual when af comes.. Usually my nipples hurt.. But they dont.hurt at all.. Im so.friggin exhausted. Barely been getting sleep having to.toss and turn all.night because of heartburn? Random its been doing that for almost 2 weeks. Why is this happening? Could af be on her way?