Guy has a yeast infection for a while. if he does natural remedies to cure it, how long will it take to cure and how will we know if he has no symptoms now?

We know he has it cause his girlfriend had unprotected sex with him while having a yeast infection many times.

I think I have a yeast infection, and I think its a pretty bad one, but I’m not sure because its my first one. my symptoms are: itchiness, burning, and excess discharge. It itches SO badly, it hurts so bad I want to cry sometimes, I don’t know if thats normal for a yeast infection, but anyways which treatment is the most effective: 1,3, or 7 day?

I’m positive I have had a yeast infection for a few weeks, but I have not treated it yet (yes I know it is a yeast infection I have had them before and my fiancee and I have been together for 4 years, I am also checked regularly for STD’s and other infections I am 26 weeks along) But I am worried about what happens if it is left untreated. I don’t see my doctor until the 11th, and the symptoms go away and come back. It’s almost like it’s curing itself and coming back. Is this possible? What harm can it do to my pregnancy? What happens if it is left untreated?