There isn't a specific time when pregnancy food cravings start. It's different for every woman – and you may not necessarily have any cravings.
If you do start having cravings, it'll probably be in your first trimester (it could be as early as 5 weeks into pregnancy). They'll get stronger in your second trimester, and then eventually stop in your third trimester.
Cravings come in all shapes and sizes. Some women crave fatty foods like chips. Others get pregnancy cravings for things they didn't like before they got pregnant, or strange combinations of food such as mars bars with bacon.
Try to eat as healthily as possible – keep those unhealthy temptations to a minimum!
If you find yourself craving things that aren't food, like toothpaste, coal or even soil, speak to your midwife or doctor, as this may be a sign of a vitamin deficiency.