Long cycles

I've been on the pill on and off during my 20's. The times I was off the pill my cycles were pretty regular (29-30 days). I've been off the pill since Dec '14 and I expect my cycles need time to regulate. I'm 30 and my cycles are hitting 40+ days. I have no prior children. Is this normal? How can I make my cycles go back to normal? I really need some support. TTC since Dec.