TTC but wacky cycles and still no luck 😳

My cycles have been running 50 days long! My boyfriend and I talked about wanting about 2 months ago, we have regular sex, yet still no luck. I pay very close attention to my fertile window, but then my period comes later and later I swear! We've talked about going to a doctor and being checked on whether somethings wrong or not.. anyone have absolutely any advice at all!? Please all d thank you❤