My son has been sleeping

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Through the night the last 3 days, and I breastfeed. The last 3 days I've woken up to swollen hurting breasts. I'm worried my breast supply will disappear. I breastfeed probably 3 or 4 times out of the day. I know I should pump but I'm like constantly worrying that if I do pump then he's going to wake up wanting to be fed. Will my milk adjust to him sleeping through the night or will my milk supply go away??