i am on day 58 - still no AF. I just took another hpt - not pregnant

however, since yesterday morning my breasts have been very sore, which usually indicates that AF is coming, but that's not the case. Also, I've been charting my basal temperatures and here is what the last 5 days look like:
98.3, 98.1, 98.6, 98.6, 98.9
i have no idea what is going on! my doctor told me to wait until april 5th and if i haven't had AF then she wants me to come in.
anyone else experiencing craziness in their cycles???
FYI - i went off the pill mid-Dec. 2007, AF - 12/10/07, AF - 1/11/08, still waiting for AF....
any advice is much appreciated!
thanks

kim