My DD slept through from 9 weeks - amazing, I know! She was doing 12 hours consistently from 11ish weeks. When she was sleeping through, she only fed 4 times a day so initially I'd try to squeeze in an extra feed during the day but she really wasn't interested, 4 suited her fine and her weight gain (and output) showed she was getting enough too.

DD would always throw in an extra feed when she was having a growth spurt, was teething or unwell and my supply seemed to adjust to her needs fine - even with random overnight feeds.

Like the others have said, your breasts are amazing things and so is supply and demand with breastfeeding. Your breasts and DS will sort it out - just be wary of mastitis though (I never had it though)