Will the DA dismiss the charge since I found out I’m pregnant and we are going to counselling?

Hopefully not! You being pregnant and going to counseling is fine but if he assaulted you, he needs to man up and take his slap on the wrist. Moreover a conviction will establish a paper trail for when he does it again and counseling or no, statistics show that odds are he will do it again. However, it is possible if you let the District Attorney know that is what you want but it will be the ADA's decision - not yours.