Breastfeeding Question.

VIIXXXIMMXVII🎀💕 • FT young mom & dad to a Babygirl born July 31st,2016 @ 39w. 6lbs even 19in long. ❤ She has changed our life before making an entrance🙌 Thank God for all we have :)
So yesterday afternoon I pump about 3oz of milk and stored it in the fridge for now is it okay to pump again right now to try and get the full 6oz & store in the same bottle/milk that I pumped yesterday then freeze it... Pleaee let me know someone ! Thank you!!