No I don't think so. But if your not careful about peeing before and after it can cause uti/ bladder infections!
Yes it can. I got a terrible one in my second trimester and my hubby and I had just started to have sex again. My doctor said that it caused my yeast infection.
Just make sure to use the bathroom after sex & wash up. The one time I forgot yo do that I got a yeast infection. No fun.
Its not necessarily sex. Pregnancy in general can cause the yeasts and fungi that are naturally on your skin get out of control.....