Symptoms like nausea and vomiting are typical during the first trimester of pregnancy but they can continue into the second trimester . Further, these symptoms do not equally manifest in all pregnant women. Some women don’t experience nausea/vomiting at all... but for others, the symptoms are so severe (hyperemesis gravidarium) that these women can dehydrate and require medical treatment. Headaches are also common for pregnant women but tend to occur as regularly as for women who are not pregnant. There could be many reasons for a headache to manifest that could/ could not be related with the pregnancy. Headaches could also be a symptom of an anxious-depressive disorder, which is common in pregnant women. Some previous or present conditions such as hypertension, sinusitis, eye disorders etc. can cause headaches in pregnant women. You may consult your obstetrician about your issues and seek professional medical advice.