Mine was HIDEOUS while pregnant with my son.
Nasty, cystic acne all over my chin and mouth area. I've never had an acne probelm in my life. My shoulders, back and chest were equally disgusting.
The good news is that it was short lived with pregnancy. After delivery, once I went back on the pill, it cleared up in a matter of a week.
The bad news, is that during pregnancy, there was really nothing at all to do. I tried everything I could get my hands on and nothing helped. Nightly steam treatments followed by benzoyl peroxide helped a little, but the zits still came.
If you have cystic acne, the best product I found was Buffering Lotion from Mario Badescu. It really does help them go away in a day or two.
But that didn't stop me from getting them.
Hang in there mama. It seems like and eternity, but everything will go back to normal after delivery.