Ay oo, normal yan sis, especially sa first trimester! A few of us sa mama group namin experienced the same thing around that time, ang hormones talaga ang culprit, plus the nausea that comes with pregnancy. But since you're already experiencing both headaches and vomiting, mas better kung i-check mo pa rin with your OB just to rule out anything else at to make sure you're staying hydrated, kasi important yan for baby. Hang in there, usually tumataas ng bahagot around 13-14 weeks!