Momma's with anxiety

Hi everyone. I have anxiety. My old therapist mostly compared it to PTSD from a past relationship. A very much past one. 5-6 years. I had gotten over it mostly through therapy but since I hit 5 weeks pregnant last week I've been having issues with it again. It think about how bad it was. How it was a rough time. And then I go crazy trying to compare my life now to back then even though there is nothing similar. This is my anxiety doing this to me. I am on Wellbutrin since it's safer for baby than others (no judgment please). It almost feels as if I am finally getting everything I want so my anxiety is trying to make me feel less than happy, like I was at first. It worries me because I don't want to be upset or stressed for the baby. I know it's not good for him/her. Any advice from anyone with similar issues? Thanks so much.