Burning in after sex?

My husband recently stared to cum in me now that I’m in birth control. But I’ve had this terrible burning after sex each time! The last time he did it I actually ended up with a yeast infection a few days later. I treated for it and didn’t have sex with him until my symptoms has been gone for about 4 days. We tried again this morning and everything felt fine during but now that it’s done I’m burning again. Please help! I can afford to go to the doctor.