Confused😮‍💨

So i’ll explain. I had my “period” from Halloween to the 4th of this month. It was lighter than usual and I thought nothing of it. A week after my period ended (the 11th) I woke up to slight cramping like i’ve never felt before and started spotting brownish discharge. Every time I would go to the bathroom that day it would fluctuate between brown, pink, and red discharge/spotting. The cramps spread to my left side from my right side and down my legs. I’ve never experienced cramps like I did that day and called my gyno. I saw my gyno and had a transabdominal ultrasound which showed nothing. My gyno is concerned it could be an early ectopic, a regular pregnancy thats very early on or a cyst which we can chalk out the cyst since it didn’t show on the ultrasound. I’m going back to the gyno tomorrow morning to see if she has anymore ideas but in the meantime i’m very freaked out. I haven’t spotted since the 11th but i’ve had on and off cramps that don’t feel like ovulation or period cramps. I just am curious if anyone else has gone through this before? I’ll add pics to the post of my discharge I had when I wiped the day I had the spotting.