So confused/worried

Brittany

I am 7 months postpartum. For the last 2 weeks or more I have had a lot of pelvic pain. I had not gotten my period since having my son but I’m breastfeeding. The last few days I have had no appetite, so nauseous, more pelvic pain. I have endometriosis but have never felt like this before. Sex is even more painful. I also am having hot flashes and fatigue. This prompted me take a pregnancy test just in case. All 3 have very faint lines. But we use protection every time and haven’t really been having sex lately do to the pelvic pain. So I find it very unlikely that I could have been pregnant. Any idea what could be going on? I gave an appointment the 29th(earliest they had). Something just doesn’t feel right and I’m worried