constant migraines?

Heather
So I'm only a few weeks into my 2nd trimester, and luckily all horrid pregnant symptoms have gone. Except now I get horrid migraines that last all day, sometimes into the night. 
At first I thought maybe it was my water intake but I stepped it up even more and they're still coming around.
Does anyone have any good pregnancy safe remedies to aid in relief?
Currently I try to lay in a dark quiet room with a cool gel pack on my foorhead but it doesn't do much.