Thanks for the advice. Unfortunately the answer, unless 3 preg tests are wrong! :)
Well, you will only have your period if you ovulate (about 14 days or so after)...but the fact that you have not yet had your period could be because A) you just recently ovulated and have not yet finished your luteal phase (the time period from ovulation till AF), B) because you have yet to ovulate this cycle, since you just got off b/c in December, or C) because you're already pregnant.
Best of luck to you!
the best thing i can recommend before goingt o the doctor is to take the at home ovulation kits.