Despite its name, you can have morning sickness any time of day. It doesn't mean your baby is sick, and it doesn't hurt the baby. Pregnancy nausea or vomiting is usually mild and goes away about midway through your pregnancy. Some women never feel nauseous during their pregnancy. (https://www.webmd.com/baby/guide/morning-sickness-pregnant)
Nausea and vomiting are common experiences in pregnancy, affecting 70-80% of all pregnant women. Although most women with nausea and vomiting of pregnancy (NVP) have symptoms limited to the first trimester, a small percentage of women have a prolonged course with symptoms extending until delivery. There are various risk factors for this condition including genetic factors, part time employment status, history of motion sickness etc. (Lee,Saha) It is not harmful for the baby and is normal is most cases.
Gestational vomiting/vomiting during pregnancy results from various metabolic/endocrine factors like high levels of hCG (human Chorionic Gonadotropin), estrogen & progesterone.
So if you suffer from nausea & vomiting of pregnancy (NVP), there's no need to worry. Just carry on taking a nutritious balanced diet and make sure you're healthy.
Read : 10 Tips for Healthy Eating during Pregnancy.