Occasional coffee during pregnancy is definitely allowed. However, you should make sure that you don’t have more than 200mg of caffeine daily. This is basically 1 mug of brewed coffee or 2 mugs of instant coffee.
Regular consumption of more than 200 mg of caffeine daily during pregnancy increases the risk of miscarriage and the risk of having a baby with low birth weight. Babies born with a low birth weight are more prone to health issues when they get older.
The 200 mg limit involves all sources of caffeine. Besides coffee, it includes energy drinks, green tea, cola, and chocolate as well.
Note that caffeine content of espressos, lattes, and cappuccinos depend on the outlet. According to the findings of one study, the levels of caffeine vary from 50mg per espresso to as much as 300 mg per espresso.
In case you need to reduce the amount of caffeine, replace the brewed coffee to instant coffee, as it is lower in caffeine. Moreover, you can make it weaker by using ½ a tsp of coffee per mug.
Finally, you can definitely consider using decaffeinated coffee. It is a great option and it resembles the taste of the normal coffee. This is a good way to trick yourself that you are getting a caffeine hit.
For further information about your caffeine intake, consult your doctor or midwife.