I took Klonopin PRN during the 3rd trimester of my second pregnancy due to anxiety and possible PTSD. I wish I'd started seeing a psychiatrist sooner and would have probably started taking it sooner.
I know take klonopin twice daily while breastfeeding both my kids. If I were to get pregnant, I would having a serious discussion with my psychiatrist about continuing, perhaps on a lower dose or a PRN basis. I think my anxiety is much more dangerous than the risks associated with the medication.
People are terrified of bezodiazapines for some reason. My psychiatrist has spent his life specializing in the mental health of pregnant and breastfeeding women. He presented me with the studies, explained the results, and I was confident taking them in the second and third trimesters, and definitely not terrified of taking them in the first.
I would suggest speaking with a trained mental health professional. So many OBs and GPs are quick to get you off any mental health medications you are on as soon as you are pregnant, with little or no concern for the affect on the mental health of the mother. Then sometime in the second or third trimester they have a mental health breakdown, and require more serious intervention and more meds than they would have had if they had just stayed on their regular medicine or a perhaps a lowered or modified dosage.
I hope that you can get the professional advice you need.