Late period

Jai

So I came off my pill roughly 3 months ago, my first period was almost a whole month late, the second one was only a few days late but this one I’m 19 days late again and my back hurts and I keep getting stomach cramps, although since coming off my pill ive been very careful. But I dontknow, what do you think ladies? Should I be worried or could it just be me coming off the pill?