Was this your first pregnancy? My daughter was born June 2009. I was always very irregular before she came along. I didn't cycle for about 6 months after I delivered (c-section). However, Now it comes every month faithfully. I was always used to a cycle about 4 times a year-- still getting used to this. Hope this puts your mind at ease.

Any change you could be pregnant again? This sometimes happens before you even have a return of your cycles.

As sarasmom said, it can be perfectly normal for it to take awhile. The average is about 8-10 weeks so some will have it return a bit sooner, some a bit later. Certainly bring it up to your doctor if you feel you would like things checked.