Midwife Nikki says: For most women, the usual pregnancy sickness starts to ease from around 14 weeks. Some weight loss is natural when you are suffering from vomiting during  pregnancy, but I feel you should see your GP, who may suggeest blood tests to ensure you are not dehydrated.

In the meantime, maintain your fluid intake and try to eat little and often - every two to three hours - as low blood sugar can be one of the main causes of nausea in pregnancy.

Pregnancy sickness won't threaten your baby's wellbeing as long as you're able to keep some food down, and drink plenty of fluids.

Excessive vomiting in pregnancy is known as hyperemesis gravidarum, and this is when you are unable to keep down any food and water, often requiring hospitalisation.