Many women have problems with nausea and sometimes vomiting (morning sickness) during the first 16 weeks of pregnancy. For some women, morning sickness may be one of the first signs of pregnancy. The term morning sickness can be misleading, because symptoms can occur at any time of the day. The causes of morning sickness are not fully understood, but hormone changes that occur during pregnancy may play a role.
Morning sickness usually goes away as a pregnancy progresses. Even though many women feel better after the first trimester, some report ongoing nausea and/or vomiting through the second trimester. You may be able to gain some relief from morning sickness using home treatment, such as changing what, when, and how much you eat. Talk to your doctor about safe medicines to treat your nausea and vomiting.