I have good news too, I came off the pill the middle of March last year and conceived the beginning of June. We didn't start trying until the end of April and realised later that June was the first month that we had actually had sex when I was ovulating.
The general advice is that you wait until you have your first proper period so that you can work out due dates etc, but that is entirely up to you. My periods were all over the place for those couple of months though, I was having between a 35 and 45 day cycle.