Severe headaches?

Heather • 24, lover of animals. Happily taken and expecting dec 2015.
I'm 4w/3d and other than a little nausea I don't have any real systems. I do however have severe headaches, mainly on the right side of my head and they feel sometimes sharp and dull. Any advice? I have been taking Tylenol but not much. I think it's mostly due to lack of caffeine (I used to drink 3 cups a day).