Ttc/no period. All over the place

Sorry this will be a long one.

So when I got pregnant with my daughter in October 2019 it was very quick. Like I got off birth control and within the month I was pregnant. She just turned a year in July so we are trying for another. I haven't had a period since getting pregnant with my daughter. I was breastfeeding exclusively and on birth control. I got off birth control mid July and was taking ovulation tests. August 8 to August 14th I got high results (using clearblue advanced) and then on August 26th and 27th had light spotting. I just assumed it was my body trying to get back in the swing of things. I got a peak ovulation result on sunday September 12th. Saturday September 18th I got a positive digital result (which I know is very early for a positive result) but even that same day I was only getting negative results. I got blood work done wednesday sept 22nd and HCG was negative so I'm not pregnant. I still haven't gotten a period. I've had mild cramping but no bleeding... can anyone give me insight on why I'm not getting my period still? Or when my body will start to regulate again and so on and so forth?