Please, help!

Hi Ladies!
​I'm so confused. I'm never EVER late and I'm close to two weeks late. No big change in lifestyle, low stress, no meds that would cause it.
​I'm getting negatives on my HPT's and got a  negative blood test. Nurse says it just may be too soon for them to pick up the HCG
​I'm super tired, peeing a lot, and emotional. Also, I'm getting severe hotflashes! I've never had those.
​Please! If you have any ideas as to what's going on, let me know! I'm going crazy!