I need advice

Okay so we experienced a very early miscarriage last month (5wks). My SO and I decided to wait a bit to try again and so I decided to go back on birth control for however long we wanted to wait. Now I had to wait to get my period to start this new BC. It came on Friday (5/13) super late at night and then stopped on Sunday (5/15). So what was it? It was light on Friday, heavy Saturday then gone Sunday. Now nothing. Was it even a period? I'm so lost. Plus I've gained weight, been constantly hungry, nauseous, tired. My emotions are stir crazy( I have bipolar so that's always a possibility) but I'm just lost.