Help please

Hello, I had a MC on may 4th 2018, I’m worried because my belly is getting very bloated and it’s making me feel upset and fat, I’ve took tests and they said negative although I know that sometimes all tests can be wrong because some people don’t have a lot of the pregnancy hormone to show up on a urine or blood test.

I feel sick and keep burping like it’s coming up but doesn’t come up, and I still have really bad cramps, what can I do please help😭😭