Coming off the pill

I stopped taking the pill in June and since then my cycles have been 29, 27, 31 and 34 days. I was so disappointed last month when AF came that this month I don't know what to do as I am currently on day 40 of a cycle. I did 2 tests 3 days ago but both bfn.

I have lower back pain coming and going, pain in my boobs every now and then and some cramping. No spotting.

I don't know if it's my body getting used tk being off the pill or I'm pregnant. How long shall I wait to yest again as I'm not sure how late my AF actually is!?

Some advice please ladies?

X