That happened to me when I was around 11 weeks along and it was because I had a UTI. I would ask your dr to test for it.
I had exactly same thing , only after sex and so we stopped doing anything. I went for a visit to my OB and guess what? She said it is yeast infection! I would say what you have is 99 % yeast infection and you just need to use 7 day Monistat treatment. That's what I am using now :( My OB said that pregnant women are prone to yeast infection much more often then non pregnant. The yeast shold be gone after treatment and you can resume your sexual activities but do not do anything before you finish the treatment.
Also, eat less sugars before yeast is gone.
i had this last time i was pregnant, it was because i had a uti. I would get checked for one if it keeps happening, plus use extra lubication so that its not so dry