Migraines

I'm a longtime migraine sufferer and three months pregnant. I'm on the verge of my first migraine since becoming pregnant. Storms have been a migraine trigger for me, and we had a possible tornado yesterday in western Pennsylvania. Any advice on how treat this? I'm not going into work today. I took Excedrin Tension as recommended by my obgyn, and I'm going to try and stay hydrated, eat something, and rest with an ice pack.