I would check with your doctor because within 9 months, I think you should have seen your cycle return. Also, have you taken a home pregnancy test? You can ovulate before having a period when your fertility is returning after pregnancy, and I would imagine the same would be true for situations such as your where the mentrual cycle is artificially suppressed.
You might check out my hubs on Birth Control and Natural family Planning. Couples can reliable space and avoid pregnancy using NFP and NFP can even help you acheive pregnancy, without the harmfful side effects of chemical contraception.
Good luck to you and God bless!