Your 3 month post exposure test will be conclusive.
You were exposed to HIV risk due to condom failure. Unprotected oral was not a risk at all. The single key risk associated with condom is, though it provides 100% protection against HIV and other STD's, its validity remains until it does not fail, and once it does, a totally protected sex turns otherwise all of a sudden.
When it comes to very serious matters related to our own life, we never believe in words. Therefore we are not sure, if she was clean or not.
Your doctor rightly said, you can not test before at least 4 weeks, even to get a reassuring test report. You have to wait now.
For other questions related to STD's other than HIV, please post your question on the relevant forum