After stopping pill, how long before periods regulate?

I have been on pill for around 11 years. I came off the pill in January and had usual withdrawal bleed at end of the packet. Then I had a period in February and March, though I can't remember how long cycles were but I know they were quite long. Since then I have had: 48 day cycle 32 day cycle 39 day... show more I have been on pill for around 11 years. I came off the pill in January and had usual withdrawal bleed at end of the packet. Then I had a period in February and March, though I can't remember how long cycles were but I know they were quite long.

Since then I have had:
48 day cycle
32 day cycle
39 day cycle
and this one I'm still on but 31 days +

Is this usual after 7 months off the pill for someone in their 20s with no underlying health issues and not over-weight. I want to try to conceive soon and wonder if I should seek advice from doctor.
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