I’m on baby no4 here (10wks old)
I’ve done bottles and pumped from day1 with all of mine and breastfed for about a year with each. It is very much a myth that you can’t alter your supply if it diminishes. I dried up entirely after a long hospital stint with no2 but then continued to exclusively breastfeed until a year.
Pump one side before first feed and pump the other side before second feed.
I’m like routine also. If I’d have demand fed there’s no way I’d have fed for as long, feeding is tiring and painful for the first couple of weeks, but then much easier than bottles from there. I believe the push to demand feed is what kills it for most as they’re just exhausted.
Demand feeding may be for you, but if not don’t be worried about supply if you put baby into a routine. I’d suggest doing 3 hourly initially.
My 10wk old now feeds 7, 10:30, 2, 5, 6:30, 7, 10 and once in the night. The one waking suits me but I’m gradually pushing that feed closer to morning now so I’ll hopefully get rid of it. I’ve also found he only needs about 3hrs sleep during the day or he’ll be wide awake in the middle of the night.
This is obviously only based on my own experience with my four.