Help me figure this out please!!

My periods have been spot on the past 4 months. Except this time I haven’t had my period for over a month. I’ve had a lot of discharge, my breast are very tender and I feel as if they’re definitely larger, I’ve been eating constantly, I’ve been nauseous, and I feel so wore out all the time. But I took a couple test around a week ago, I even took the last two 2 days apart and they were all negative. I’ve been pregnant before but had a miscarriage at 6 weeks.. Could my body just be messed up? Can anyone give me advice? I have a doctors appointment next tuesday!