Just because your dads mom was like that, doesn't mean you would be, too.
Pregnancy hormones, who knows, could possibly offset, things and in a way of preservation, keep you, even keel.
Being mindful, could help, having coping mechanisms in place, a supportive other half. Sleep, diet, under physicians care, regular therapy check ups. Assuming you'd desire breastfeeding, would mean, off meds until baby is weaned.

At, the same time, it's good, to give serious thought to this. Bet your dads mom, didn't give, as much thought, as you are, without even having a baby.

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