I am on my 2nd month of ttc after bc. My cycles are still not normal, so make sure you chart your temps and use OPKs. They will help you time things a lot better until your cycle gets back on track.
I had a really long first period after getting off of bc. Good luck! I hope it happens right away... try not to stress too much about it. I know it will be hard, but think more about staying healthy.