I was on the pill for a long time before TCC number one and I was not hugely irregular after but there was enough of a. Difference between each cycle to make it hard to pinpoint ovulation (though I wasn't charting or monitoring cervical fluids at the time which would have made it easier). It took a long time to conceive DD and in part i blame the pill, also you can't rely on what your cycles used to be like pre-pill as often the body will find a whole new cycle once it adjusts (length, luteal phase etc).
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