HI, I understand your concern. Blood pressure tends to raise in pregnancy when .. there is high blood pressure history in family, high blood pressure patients, urinary infections, sever physical/ psychological stress. In your case.. there is family history, you you are predisposed to such symptoms specially in pregnancy. It may recede back to normal after delivery/ continues to be high. But this is not a point to be concerned, on the other hand psychological stress increases the chances of having raised blood pressure. The wise way is to be in touch with your gynecologist regularly/ get investigated & examined regularly & take medicines prescribed regularly. An ideal life style with healthy nourishing diet , restricted salts/ regular walking exercise & yoga exercises with Pranayama ( respiratory exercises) & meditation help a lot. Thanks.