Confused

I have hypothyroidism so my cycles are nowhere near regular. AF hasn’t been here since June 7th. I took a test a week and a half ago and it was a BFN. Last Saturday I had slight spotting followed by cramps and my lower pelvic area was tender to the touch. It hurt to even walk. Along with that I had a lot of creamy discharge and nausea. Today I’m getting hot flashes and lightheadedness. I’m not sure what’s going on. Any input would be helpful!