You've received some good suggestions already.
I'm not pregnant and I'm not really suffering from acne - just an occasional zit or two - but I started to use a homemade cleanser and it has helped my skin look a lot better and feel very clean. I use it twice a day, morning and bedtime.
I put a little witch hazel into a bottle (about 1/8th cup? I don't measure it) and mix in some epsom salts (maybe 1/4 - 1/2 tsp?) and add several drops of lavender oil and tea tree oil. Shake it every time you use it and put it on a cotton ball and rub your face and other acne prone areas with it. It smells pretty strong, but I like the smell! When I first started making this I didn't put in the lav and tea tree, and it still cleaned, but I feel like the oils help disinfect. They are natural antibacterial and antifungal agents. On at-home days I even use it for a deodorant.
You can get the WH and the ES in the pharmacy area. Get the other two items at a Whole Foods or Sprouts or herb store - I get mine at Herb Max at the intersection of Alma and Spring Creek Parkway in Plano.