Zoloft while pregnant?

Any Momma's to be pregnant and taking Zoloft? I was on Prozac prior to finding out I was pregnant, my primary care instantly told me to stop taking it. Prozac caused weight gain for me, which sucked. 
I just hit my 2nd trimester and my anxiety is back full force with spurts of depression. My OB has prescribed Zoloft and I was wondering what other people have experienced while taking it. 
What side effects did you have?