1. Morning Sickness/Vomiting

Source: CityMD

This is due to hormonal changes in your body as a result of the pregnancy.  It is very common in early pregnancy but can persist throughout pregnancy. 

It is unpleasant but usually clears up by the 16-20 weeks and does not put your baby at any increased risk. 

If you are struggling to keep anything you eat/drink down; and/or is making you feel unwell, seek medical attention urgently, it might be a more serious case known as Hyperemesis Gravidarum, that needs urgent medical attention.