Anxiety problems

I was diagnosed with an anxiety disorder 3 years ago. Since I got pregnant (25 weeks yesterday) with our little girl I stopped taking the meds. I have been having PTSD nightmares lately that are making my anxiety come back 10 fold. My nightmares stem from my ex brother in law drugging and raping me when I was 13. I think being pregnant with a beautiful little girl is just making me freak out thinking of what happened to me possibly happening to her. I never told anyone about the rape other than my husband and brother. I feel guilty for not telling my sister though. Are there any safe for pregnancy anxiety meds out there? And would it be worth it to finally tell my sister to get it off my chest and possibly make her feel guilty to see if it helps me or just keep it to myself? She has a daughter with this man. It happened over 15 years ago.