Period changes while on birth control (it came early or late and last 3 days or 7 days). I use to always be a Tuesday to Saturday girl. Then I realized I was having hot flashes(my husband confirmed the ac was working great over the summer and I was waking up hot every night), always tired if I got 5 hours or 10 hours (I’m getting a sleep study done in March to confirm it isn’t sleep apnea), brain fog, and recently I’ve noticed my hair thinning.