Burning sensation?

A few days ago my doctor called and told me I have BV which I don't think I've had before. Well being pregnant I'm just not in the mood for sex as often but when we do I've been getting like a "burning" sensation afterwards? That goes away after awhile tho. But Is that normal for having BV? Or could it be something else? Like being pregnant or from not having sex as often? -- I'm 19 weeks pregnant if that matters.