Continuous headaches during 2nd trimester pregnancy?

I just hit 17 weeks prego and since iv been about 14 weeks pregnant iv been having headaches. at first they weren't to bad but now there more and more frequent throughout the whole day and tend to increase when i move around. I just wanted 2 know dose any one have this same symptom and is it normal during pregnancy are is it probably deeper then that? what should i do I'm a bit worried.