Does it matter that my baby's side teeth came out first?

No. Typically your baby will get the middle bottom teeth first; however not all babies read the textbook and this is fine.
No. Most babies get the 2 bottom center teeth (incisors) first followed by the 2 upper central incisors, and then the 2 upper lateral (side) incisors. However it is not a problem if the lateral incisors are present prior to the central incisors.