Best source of caffeine?

M.J.

I am 17 weeks and exhausted. Between working full time, going to graduate school, watching my 1.5 year old and being a wife I only get about 4-5 hours of sleep. What is the best source of caffeine? I drink my daily intake of water but when I just need a pick me up should I do soda I coffee? I drink all sparingly and I know the recommended amount is up to 200 mg for pregnant women.

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