Do I have to pump??

Erika

Baby girl is 13 days old and eats well on breast, I sometimes pump also but my question is do I have to pump to get my supply up for when she grows and needs more ore will my body produce the amount she needs as she grows on it own ? ... I just want to make sure if she needs more it will be there with out pumping if I need to pump I will just curious never breastfeed exclusively before .