I've found the discharge I get in pregnancy looks very similar to what I usually get with thrush, but with pregnancy the volume is much greater and there's no itching. If you have thrush, you'll know, you'll feel itchy and irritated and miserable. I wouldn't treat it unless you are getting the itching and irritation. Those pills and creams can really screw up your vaginal pH and the healthy bacteria that you need in there. If you are concerned, see your doctor and have them test you. Then treat it if it is in fact thrush. More than likely though, it's just your body doing exactly what it's meant to, unless you have any obvious symptoms.