Headaches are quite common for pregnant women. They can occur because of changes in your hormones as well as blood volume after you become pregnant. Changes in your posture as well as caffeine withdrawal can also lead to head pain.
Headaches that occur during your first trimester are most often because of hormonal changes. When you develop headaches during your third trimester, it’s usually because of tension and poor posture from carrying your child. On occasion, they could be signaling a more severe condition like sinusitis or preeclampsia. If you have a headache that comes on suddenly or is extremely strong, contact your doctor immediately.