Could be (probably is) absolutely nothing, but get checked out sooner rather than later, nonetheless. I had a hideous headache when I had pre-eclampsia with my first pregnancy. I hope you feel better soon.
Basically said it all in the headline haha! Ill be 25 weels tomorrow, vaby number 5 and have never experienced a headache like this in previous pregnancies! Ive stayed well hydrated havent eaten a great amount as feel quite bluergh. Any experiences or advice please xx