No sign of af or ppt

I have been with my fiancee for 3 yrs, i have a 10 yr old daughter from previous mistake 😒soo i been ttc since and nothing, im irregular, i havent had my period since august 4... Did a pt negative 😔...i have no idea was is gng on with my body.. I had an appnt to doctor but unfortunally had to b reschedules cuz i got there late 😡... I dont really have any symptoms either ... Has anyone been like this and wat some of u guys tried to get a positive any suggestions