You can have up to 300mg caffeine per day.. any more can contribute to miscarriage. So just remember things like chocolate, tea and some soft drinks also contain caffeine.

Heres some approximates:
Short black/Espresso coffee = 107 mg per standard serve, commercial purchase
Plunger/percolated coffee = 60 - 120 mg per 250mL (8oz) cup
Instant coffee (1 teaspoon per cup) = 60 - 80 mg per 250mL (8oz) cup
Decaffeinated coffee (1 teaspoon) = 3 mg per 250mL (8oz) cup
Tea = 10 - 50 mg per 250mL (8oz) cup
Iced tea = 70 mg per 250mL (8oz) can
Caffeinated ' Energy' Drinks = 80 mg per 250mL (8oz) can
Cola drink = 40 - 49 mg per 375mL (12.6oz) can
Hot chocolate = 10 mg per 250mL (8oz) cup
Chocolate milk = 5 mg per 250mL (8oz) cup
Milk chocolate = 20 mg per 100gm bar
Dark chocolate = 70 mg per 100gm bar
Chocolate syrup = 5 mg per 30 gm