Confused or just going Crazy

Plove2213

Good afternoon everyone! So I have read through a lot of different scenarios but I haven't seen one exactly like what I am going through and I am confused at this point. My cycle has been spot on for 5+ years until last month. I am currently 28 days past due and i have been crazy nauseous and throwing up every morning for almost 2 weeks now. My breasts are sore, and I'm always tired. I also have bad headaches now, constipation, heartburn, major bloating or pushing feeling in abdomen and honestly some freaky dreams. I have taken a lot of HPTs and i have had 5 that were positive in the last 2 weeks. However, when I went to my doctor, i now have 3 negative blood tests and 3 negative pee tests. The last positive i got was Thursday but the blood he took that day was still negative. Am I just losing it at this point? My doc has scheduled an ultrasound for this next week because he is completely baffled. Oh i am healthy, active, and don't smoke or drink. And I am not under any stress. Is it possible I have had that many false positives? Any insight would be helpful, 

Thanks and Merry Christmas!