Patch, you have a similar age gap that I have. We went down to one feed a day at one point during the pregnancy around the 18-24 week point. Was back up to 3 times a day (morning, nap time and bedtime) in the third tri. Then when DS was born and took over my knee and the proper milk came back she picked up her feeds to match the baby!
We had runnier poop as well. DD also wasn't bothered by it.
We had runnier poop as well. DD also wasn't bothered by it.