I was a 34b and recently had 380 implants. What size bra should I be?

Thank you for your question. It is difficult to tell without your measurements and without assessing you in person. Please wait until 3 months post op before getting fitted 

Thank you for the question.  
 There is no accurate/reliable/predictable correlation between size/profile breast implant utilized and cup size achieved. For example, I do not think that the generalizations of "200 cc equates to 1 cup" hold any validity or are helpful in any specific or practical way.  In my practice, I ask patients not to communicate their goals, or evaluate the outcome of the procedure performed, based on cup size references.
It will take a few months for everything to heal and settle and to see the final outcome.
Best wishes for an outcome that you will be very pleased with.

Pictures or an in person examination would be necessary to answer your questions. Thank you for question and congratulations on your recent cosmetic surgery.