I just don't get it

I took two pregnancy tests and they both said positive, I made a prenatal appointment to go make sure me and baby were both ok, I went to take another test just for confirmation and it said negative, I started bawling and cancelled my appointment. I've been moody, a little cramps, bloating, I feel sick every morning for a couple hours and my nipples are pretty tender, and I've been peeing a lot the past few days. I'm so lost with positive and negative result and having symptoms....