Any ideas to help acne?

I have never really had that much trouble with acne since I was 14-15 but now I'm 20 years old and 10 weeks and 6 days pregnant and my skin feels out of control! It's so greasy and nasty feeling and I just don't know what to do, I was using a face wash but my ob told me to stop because of the chemicals in it, any suggestions? I'd be so greatful for any info!!