PC: I have boobs that only fit an A cup when dd was still exclusively bf or when she had missed a feed. I only went up one cup size - from an AA. They don't make maternity bras that size so i stuck to wearing sports bras and tight vest tops. I don't think i was ever engorged when my milk came in and dd wasn't feeding well due to jaundice and rubbish bf advice in the hospital.
still we are still feeding at 22 months with no signs of stopping
she never slept through and still doesn't we cosleep and i am happy to feed her at night still.
in addition she Never Ever went even 2.5 hrs between feeds in fact, she usually went between 1.5 and 2 hrs, absolutely max in the daytime.
it is not how much milk your breasts can store. I read somewhere just recently that storing capacity can be 300% different in women but over 24 hrs, by feeding on demand, both women can produce the same amount fo milk. empty breasts make milk faster than full ones and as they feed, you are making milk. I do feel my letdowns and in 20 mins, i can feel multiple letdowns. they may only be half an oz or less, i am supposing but it was thick fatty milk.
(because i used to express at work and could measure them as i would get a second letdown if i kept expressing past when the milk stopped flowing)
hon, your body didn't bring you and your baby this far to let you down. trust your body and trust your baby.
and start to enjoy your baby.