I think it also depends on the type and kind of pill that is taken.
Currently, most pills are a mix of progesterone and estrogen, both hormones naturally supplied by the woman's body. When you add it, it causes your ovaries to be "tricked".
I was on BC since the age of 14, and having had a bought of cervical dysplasia, and after having our child with major complications, we decided to go ahead and get my tubes tied. We did opt to have just the clamps without the cutting and "burning" of the fallopian tubes, therefore, it has a higher chance of being reversed if we ever want to try to have children again. (highly unlikely)
Then there are the plethora of other BC methods, such as the patch and the shot, and of course that crazy Norplant.
I read some studies that suggest the BC pill actually helps to guard against some cancers, such as ovarian, as well as ovarian cysts and such. But, I've also read some studies that suggest the BC pill increases the risks of some cancers, such as cervical and breast.
If it's been three months already, and you're going into the fourth month, I would at least call the doc for an opinion. She could be feeling "fine", which is great, but that doesn't mean that, just for the sake of comfort, a phone call can't be made.
I'm surprised that the doc said just to stop BC, cold turkey. When I came off the pill, the doc lowered my dose, and then lowered it again, over a 2-3 month period before I stopped completely. It gave my body a chance to adjust to the hormone differences without so much shock.
Good luck!
Shan