I have noticed that when my husband and I have sex, I frequently get a yeast infection. I treat it and it goes away, we have sex once or twice and I am fine. Then on the third or fourth time (this is usually over the course of 2 days) I wind up being in pain again from an infection. I am 8 months pregnant and I am curious, WHY is this happening?? How do we fix this and keep it gone?