Help Cardiologists, or Obstetricians! Orthostatic Hypotension((76/43) & pregnant?

I have had orthostatic hypotension for a few years now, am 6 months pregnant, and 26 y.o. I went to an OB appointment today but my regular doctor wasn't there to see me. They had to check my blood pressure 3 times to make sure they were reading it right. It was 76/43 this time! They sent me home, telling me to take it easy, drink ots of water, and lie down whenever I feel like I am going to faint. How low does it have to be for me to be really worried about myself and the baby?

When you say orthostatic hypotension, does your BP drop to 76/43 when you stand form a sitting/lying position and stays there or is it persistently 76/43?

If it is persistently 76/43 I would advice you to get admitted to hospital at least until you get checked by your regular OB. Not knowing your personal history, the cause of your low BP and how well you are coping with this extremely low blood pressure, that is the safest course of action that I can prescribe.

Is baby moving normally and kicking as he/she did before? If yes, then this is a good sign that things are going ok. If not, its time to be worried. I would sleep easy if the ultrasound was ok, and the CTG (it's something like an EKG, but of the baby's heart) was reassuring. Was your blood workup normal? Has your pregnancy so far been uneventful? Has all the antenatal scans been normal for your baby? Is baby growing well? These would all point to your blood pressure being less of an issue (although I wouldn't rest easy if I didn't find out WHY you have such a low blood pressure). In the mean time, keep up your fluid intake and when you lie in bed, do avoid lying flat on you back, best position to adopt is to lie on your left side (this improves blood flow to the baby).

ask them, they are the professionals
not here- with a bunch of strangers ( no medical degree)

Frequent monitoring of vital signs (temperature, pulse, rate of breathing, blood pressure) and/or hospitalization may be necessary.
ECG and serum electrolytes and glucose are routinely checked. However, these and other tests are usually of little benefit unless suggested by specific symptoms.
Please see the web pages for more details on Hypotension and Orthostatic hypotension.