Pumping a small amount

My son is 4 days old. I EBF him. When he sleeps my breasts fill up and get painful. So today I pumped a little to ease the discomfort and I only pumped 1 Oz and that was on both breasts. What do I do with such small amount of milk? I don't want to throw it away, it's not enough to bother putting in a bottle and I know I can only keep it for so long. Any suggestions?