Low blood pressure - 26 weeks with twins

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I’m currently 26 weeks with di/di twin boys. In the last 3 days I’ve almost passed out 2 times, I think due to low blood pressure. I haven’t been doing anything extra strenuous at all so I’m not sure what’s changed. I have an appointment with my OB tomorrow. But want to hear from you if that’s normal or if there is something I should be doing or watching for?