Should you only take 1 prenatal vitamin?

This is my first pregnancy I am 5w 4days. Should I only take 1 prenatal vitamin or is it better to take 2 or 3. The bottle suggests take one daily preferably with a meal. Would it hurt my baby to take one in the morning and one in the evening? Also does the brand of vitamins matter? I purchased the cheaper ones. Thank you in advance :)