Since you've recently gone off the pill, give your body time to readjust to it's normal/natural state. Those pills have altered that state and it's just your body's way of getting back to where it needs to be. After I got off the pill years ago, I had 1 regular cycle. Then the rest of my cycles were way out of wack. They didn't become normal till about 7 months later - longest cycle was 56 days for me. With cycles out of wack, you could be pregnant as I've had a friend get preggo after a month off the pill. On the other hand, you may not get preggo right away as your body knows what type of environment is necessary to produce and carry a baby.
Take your prenatals, fish oil supplements and especially evening primrose oil (helps regulate). Read the book Taking Charge of Your Fertility (bought my used off of Amazon) to know what's going on with yourself. Chart your cycles/take your temps. Best book I ever read. You know when you're ovulating, when you're pregnant and the day you'll get your period -- sometimes hours before you even get it!!!! If something is wrong, you'll see it in your charting and it's helpful info to bring to the doc.
Lastly, be patient. Easy to say, but hard to do :) I'm never going back to the pill and until recently was using FAM (Fertility Awareness Method) charting to avoid pregnancy. Now I'm using it to become pregnant.