I need some support.

I'm so confused with my body right now, I think I had a chemical pregnancy but I'm not sure. I took 6 hpt test 2 of which came out positive, but faintly, so I called my doctor. She set me up with a blood test, which was negative so today, at my appointment, she thinks I might still be pregnant and ordered a Qualitive and Quantative test. If I'm not pregnant, then I have no idea what's going on with my body. I've had two successful pregnancies, and I have a lot of the same symptoms, only much worse. I feel motion sick all of the time, and smelling meat cooking makes me vomit. I'm peeing more (but this may be because I'm consciously drinking more water) my ankles swell through out the day, I get lower back pain, and my c section scar feels like it's tugging. I'm not sure how else to describe that feeling. My cycle is all over the place right now, but I usually get a period at least once a month, but I missed one in May. If this test comes back Neg, my doctor wants me on Progesterone, which should help regulate my cycle. Any words of wisdom or advice is much appreciated.