I would also recommend going to the doc for a checkup. That consult threw a spanner in the works for us as I needed some vaccinations. After I had my booster shots I had to wait a minimum of 4wks before conceiving. I also found out I was low in vit D which is important in foetal development.
Also download (if you have an iPhone) a period tracker. This way you can chart your cycles and it will tell you your fertile days and approx ovulation date. It might be worth going off the pill now then charting your cycles till march. Just use alternative contraception. Good luck!