Has anyone else had this problem!?

Help! So I have a 18 month little girl, and I’ve had a normal, on track, every 28 days period. The last two months October and November I have missed and it’s not normal for me to miss. In November I had brown discharge/spotting and it was only when I wiped. I have taken multiple test and they’ve came back negative. Has anyone had this problem? Could I still be pregnant? Like I cramped really bad in November before the brown discharge, and then I’ve had no appetite to eat and I’m sore in the boobs sometimes not all the time. My face is broke out, hair is failing out more. I didn’t have these signs with my first.