I have a pdoc appt set for about 2 weeks past my edd already, because of the severity of my PPD last time and subsequent BP diagnosis, too. I am medicated and stable right now, but I worry so much about PPD after the baby.
At least this time I know (I hope) what to look for.
I would say make an appt soon (call Monday) and see about whether prozac is still the best option for you and whether you may need to up your dosage.
The only thing I can say is certainly make the call.
Take care of yourself.