Low blood pressure.

Anyone have episodes where you get dizzy and feel like passing out and your BP tanks super low? Ive had a few episodes this week and just took my BP twice in 5 minutes while this was happening and it was 80/50 and then 95/62 and then 15 minutes after the first one it was back to my normal of 110/70. I have had episodes once every other or every 3rd week of heart palpitations in the evening but usually my BP doesnt tank or i dont feel dizzy when those happen. Never happens at a dr appointment so they cant give me answers. Currently 17 weeks and some change.