Holly,
I have struggled with acne since going away to college, 19 yrs ago. I am 37 and still struggle with acne. In my recent research, I've found that FlaxSeed Oil 2 TBS morning and night could help and possibly an old wives tale of rubbing 1/2 lemon directly onto your face every evening (sounds strange but may be the safest since you are pregnant).
A college friend recommended the lemon when I was in college. She said her grandmother did exactly that to her and the lemon juice cleared up the acne.
Seeing how you are pregnant It would be best in talking to your dr about the amount of Flaxseed oil is safe for you to consume.
I know exactly how you are feeling. Stay strong.
Sending you the best wishes,
F.