Aw first time mommy, yes it's common sa first trimester dahil sa hormone changes and stress, pero if it's really severe at may lagnat pa, kailangan mo talaga i-check with your OB agad, hindi dapat i-ignore yan especially ngayon na buntis ka pa lang. A few of us moms had headaches din during early pregnancy, pero kung sobrang intense or may other symptoms, better safe than sorry talaga!