See your doctor on Monday. It can be a number of oral conditions or infections, which can be bacterial, fungal or viral origin, and would need proper medications to treat. Strep throat can be bacterial, but there are viral ones too, and white patches in the mouth can be thrush, a fungal infection, or combination of infections, and in the throat thrush is esphogitis, can go to the stomach, become systemic from there into the bloodline, which is then invasive or dissemintared candiasis, which has a high rate of failure, the same with strep throat, can go to the lungs, become systemic too, and be more difficult to treat.

Good luck