Re: Irregular periods
If you're not ready for another baby, I think you need to use some form of contraception. Your baby is older, you've had your period several times. There's every reason to think that your body is ready to make another baby, even though your cycle is currently irregular. My guess is that the mini-pill is what made it appear irregular- one of the most common side-effects of hormonal contraception is scanty or absent periods.
When will your period get back to normal? Really, really hard to say. Everyone is different and you just don't have enough data on which to base a conclusion. If you want to get that data, I'd start charting your basal body temperature and other fertility signs. If you've never done that before, pick up a copy of Toni Weschler's book "Taking Charge of Your Fertility"- it's a terrific primer.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"