I just got over a yeast infection, and that's what this sounds like. It's horrible. I hear eat yogurt, and it's okay to use the over the counter yeast infection medicine. If your too worried call the doctor tomorrow and they'll give you advice.
It's common to get yeast Infections more easily when you're pregnant. Everything's different down there. My bf always asked if it was normal to be so 'wet'. Haha I told him yeah less work for you. You can use the monistat or generic version. I'd say using it the longer the better works. Also, I found using baby shampoo to wash was less irritating than usual soaps. That gives me a heap of problems.
Oh and the doc can give you a pill to get rid of it in what seems like hours. It's awesome.