Migraine and Aura during pregnancy, anyone else?

So i am 28 weeks and this pregnancy ive had 2 migraines with aura. Migraine and aura is not a new thing for me but I never got them in previous pregnancies and my trigger was normally the pill so i had to go off it. Today my migraine was awful. I felt dizzy and strange for a hour or so before the aura, then within 10 minutes i couldnt see out of my left eye at all. My right eye was like looking under water. Worst part, I wasnt home and still had to drive home. It worries me because when they hit with no warning, i could be out with the kids and i feel like im putting my life at risk and those around me. I got home ok... but called birth unit as my midwife advised me to. They want me to do blood tests. Has anyone else had bad migraines during pregnancy? What helps? I dont really get the headache too much... just the eyes and light sensitivity and a feeling of being hungover