Yes, you can still enjoy a mug of coffee every now and then during your pregnancy. Just make sure that you don't have more than 200mg of caffeine in a day. That's two mugs of instant coffee or one mug of brewed coffee. If you regularly have more than 200mg of caffeine a day while you're pregnant, you'll have a higher risk of miscarriage or having a baby with a low birth weight. Babies born with a low birth weight are at increased risk of health problems when they get older.