Nausea during pregnancy (referred to as morning sickness), is triggered by the hormonal and physical changes taking place in a woman's pregnant body. It can occur at any time of day but usually tapers off by the 2nd trimester. However, the intensity of the nausea varies from every individual, and some pregnant women will feel nausea throughout the entire pregnancy. Morning sickness is not harmful. However, if you have trouble keeping food down at all, or the morning sickness comes with fever and weight loss, you should consult your doctor already, to rule out any further complications. For mild nausea, you could talk to your doctor about taking supplements for nausea such as vitamin B6. To prevent aggravating the condition, you should not skip meals and also avoid spicy foods. Most importantly, you should ensure you drink plenty of liquids too to prevent dehydration.
Yes it is normal. I did not experience any vomiting but I definitely know how it feels as I have gastric acid reflux, the worst scenario was I vomited everything that goes into my mouth including water. You can get relief by eating smaller meals, do not drink too much fluids at a go, avoid lying down after eating as it my cause indigestion, try to look out for foods that trigger the vomiting and avoid it. Try to rest your body more.
According to book i read, morning sickness may extend into second trimester and some into third (especially those carrying multiples) trimester. It is perfectly normal. In fact for some of my colleagues, morning sickness only came in third trimester.
Yes, some people don't feel nausea during 1st trimester but start to have it on 2nd trimester. It is normal but not common. Different people react differently. But I read from articles that those who only started morning sickness on 2nd trimester might continue to have it in ur 3rd trimester, u got to take care and ear many small meals to avoid nausea.