Af was due today but nothing yet...

I usually know when I am going to start but I just don't feel it coming.. I tested two days ago and got a BFN .. Honestly I feel a bit prego but it could just be that I want a baby so badly... My girls hurt bad and my nips are darker and I am so incredibly sleepy plus I swear it feels like I go to the bathroom every hour !?! What should I do? My last pregnancy my levels were low and I could never get a BFP and I lost my baby? Could this be the same thing?