I had breakouts right throughout my pregnancy (even on my back and that's NEVER happened to me ) but they did calm down a bit probably about half way into the second trimester. I did try Pro Active for a while and although it helped a bit, it's pretty harsh IMO (it bleached my towels and pillowcase!) so I stopped using it - sent it back for a refund actually.

I ended up continuing with my normal routine and things eventually calmed down. My skin was well and truly back to normal by the time DD arrived.

I honestly think as it's hormone related, there's not a lot you can do except ride it out.