Your OB and NP need to work together to safely manage your BP while pregnant, So seeing a OB Before you are pregnant is really important
Mood shifts can be Bipolar , sure... But mood shifts happen with hormones and sometimes just because it can or you have a right to explode.
I didnt know I had Bipolar when I was pregnant.... that was 20+ something years ago , I was just diagnosed at age 43 ( 50 now) My Daughter has Bp 1 ... I felt guilty for a long time but she finally drilled it into my head that I am not to blame and she loves her life even with the Bipolar part...
Good luck on your Baby journey