Yeast infection ?

So I think I may have a very mild yeast infection. Not much itching at all, if any. Just gross discharge and a little discomfort. My so went and got me some monistat 1. The one with the ovule insert. I’ve never used monistat as this is the first time I think I’ve ever had any type of infection. I’m wondering if I should use it? This has been going on for about 2 weeks maybe.. it started with a little rash on my vulva after going swimming. Since I’m 7 months pregnant I felt I was just too sensitive right now and the pool irritated me but ever since it’s been a bit off. Should I use it or wait it out ? Also if I do use it how long would I have to wait for intercourse? I’m just afraid putting anything near there even medicine will just irritate it more..