From what I've read and what I experienced, when I went off my BC, the first 3 or 4 months were very normal and on time....for A/F. Then after that it was a little off here andthere and not heavy, wouldn't last as long, ect. It can take anywhere from 6 months to a 1yr for your body to adjust to being off the pill. Remember it takes time for the pill to get into your system and its going to take time for it to get outta your system. Give it time.
My husband and I were TTC for just under a year...I had one late night of light red bleeding (which turns out it was implantation bleeding) and now I'm pregnant! Be paitent, it will happen!