I would definitely talk with my OB about what to take.
Are you sure it is thrush (vaginal candidiasis)? Did your doctor check? There are several different types of vaginal infections.
I'm just very cautious, because I had vaginal bacteriosis (without noticing even) and that can lead to miscarriage and premature labour and needs to be treated with the according antibiotics!
Eating (and applying) yoghurt with lactobacillus might help clear it up, but I would recommend seeing a gynaecologist.