Aw mommy, headaches in pregnancy are super common, a lot of us go through it, especially around your second trimester because of hormonal changes and increased blood volume. Try staying hydrated talaga, drink lots of water, and get enough rest kasi sometimes it's just our body adjusting. That said, since you're pregnant, mas better to check with your OB about it just to be sure, lalo na kung it's bothering you or if it gets worse, they'll know best kung normal lang it is or if kailangan ng something else. Sending you hugs, pregnancy can be tough!