Irregular periods while breastfeeding?

I currently have a 9 month old daughter and I had my first cycle postpartum on March 10th. My cycles before I got pregnant were 33-34 days. Does it usually go back to that after you give birth? We aren't really preventing pregnancy right now nor are we actively trying. We tried for almost 3 years to conceive my daughter so we would be thrilled to get pregnant again. But my question is were your cycles irregular while breastfeeding? My daughter no longer night nurses and breast feeds 4 -5 times a day since she is now eating solids. Anyone get pregnant while verdigrising?