10 days Late, Neg HPT help!

My DH and I have been trying for six months. AF is now 10 days late, and I have never been late in my life! My normal AF symptoms are no where to be found. Instead I have a dull cramp that kinda comes and goes and my breasts are really sore. I’ve even experienced a light brown discharge twice. Still, Two BFN hpt’s!

I went to try the Dr to POAS and the nurse talked to me like I was crazy to think I was pregnant and to not even come back to test for another month!

If I’m not pregnant, what’s going on!?