Medication in pregnancy

So I'm 32 weeks pregnant and have just started seeing a psychiatrist and have been diagnosed with PTSD from childhood trauma that has escalated and given me paranoia. I have just received a call and they would like to give me a trial of some medication. She said it's reasonably safe for pregnancy but the thing that is making me reluctant is that she said "reasonably safe". I do not want to take anything that is going to harm my baby. I just don't know what to do. I want to get better so I can be in a great state of mind for when baby comes but the risk or potential side effects just isn't worth it. I guess I'm seeking advice, I'm just not sure what to do. Posting anonymously cause this is embarrassing for me.