13 weeks and constant headaches

Is anyone else experiencing headaches daily? Before pregnancy I didn't experience them much except for around my period as a part of my typical PMS . Now this week I've had at least 4 one lasting from 8 pm, through my sleep, to 3 pm the next day when I received some Tylenol . It was so bad I couldn't go to work ( I work fast food and the bright lights and loud noises would've made me even more miserable) . It's a throbbing headache where my head feels heavy. This is rather recent, last Friday was the first time. I've read that it's a normal pregnancy symptom , has anyone else experienced it?