Blood sugar or just pregnancy

so I had problems with my blood sugar bottoming out in high school but it was never regular enough for them to do anything t was just here and there. Since then it'll happen like once a month or every other month I just get a bad migraine and get really dizzy or I'll just get lightheaded and stumble a little and if I eat or drink something it'll usually fix itself. So anyway yesterday afternoon I got a bad migraine and I took some of the medicine my OB gave me for migraines and it wouldn't go away. I just felt like crap all night and went to bed early. I woke up like every hour and a half to two hours to pee and I was so thirsty every time I woke up I drank like literally almost a whole bottle of water. I literally drank 5 whole bottles of water last night. Since I got up I've been really dizzy and tripping over my own feet and feeling like I'm gonna pass out. I got so dizzy I actually fell once today already. Thank goodness I fell on my side and not straight on my belly. But still. Does that sound like blood sugar? I passed my sugar test a few weeks ago. And I've ate and drank a lot today so idk why it would be acting up. I don't wanna call my doctor over nothing. I go back a week from today.