Headaches @ 12 weeks

I've had a headache for 48 hours. It's my forehead and just a constant ache. Tylenol 500 mg did help, but I don't want to keep taking it.

We live in California, so it's a dry climate but I'm well hydrated. My boobs are bigger and sore...?

Any ideas as to why I can't get rid of this headache? Anyone else having headaches?