OK, I shall confuse you even more. Taking the two drugs together actually increases the serum estrogen in the blood. There is a drug interaction here and I would not recommend long term use of them together. It is not likely that the two will cause a contraceptive failure.
Now, getting off the Sproonax may give some risk. Because the sporanox has increased the serum level of the active birth control ingredients, you body may be registering this as your "new normal." So, when you stop the Sporanox, you may ovulate.
There is no clear literature (that I am aware of) on this. I do recommend to my patients that they use condoms as they leave the Sporanox until their next period. I am not saying your doctor is wrong at all. I just do these things on the safe side and this is an issue that cannot be simply handled in web postings.
Spotting is an ironic consequence of the higher serum levels that is not explained by any pharmacology theory. It just happens. And being new to the pill also often results in some breakthrough spotting.
Relax and I am sorry that this is not amenable to a simple yes or no. It is very unlikely that you have become pregnant but I do recommend protecting yourself when you stop the anti-fungal.
Brandye
Posted: 28 Sep 22:49