Natural ways to treat a severe vaginal itch please / is there any ?

-- am a FTM with a vaginal itch only or most severely only at nights

-- 32 weeks along

-- worse if I take a even a little bit of sugar

-- gets worse to worst only between 1 am to 5am . Why ?

Should I be worried ? Is it connected to pre term labour or something? Or even connected to or will reduce my chances of a natural birth ?