Hi,
Sometimes it takes a few months to get regular after the pill. How long were you taking it? I was on it for 7 years and it took AGES for my cycle to become regular afterwards. My sister-in-law had a similar experience, she only had 2 periods in 8 months after stopping the pill.
Maybe you could start doing ovulation tests to find out when is the most ideal time is? If your irregular you may have to do them each cycle.
And with the doctors, I was ttc for 8 months and the doc still wouldn't investigate. But you may find one thats a little more helpful.