Vaginal fungal infections

Hi everyone, I have white discharge 3 days now and it's super itch down there very uncomfortable. Last time I had it is November last year and it last like a week. I treated it with miconazole 1 day treatment since the first day I notice it and still having discharge. Is anyone can tell me whether this is a serious illness? I'm worried and thinking this might be one of the reasons why I can't get pregnant. Is this normal? Thanks in advance to all who can share their experiences or opinions. God bless everyone!