water fully, or in this case a radius slightly larger than canopy as it fills into pot, but still make sure it runs out the bottom, or you might not be saturating everything underneath the plant.
then, wait for it to dry a bit as usual -- top 1" or so at this point is good. feel weight, yadda, yadda, yadda..
yellowing and browning won't be from overwatering. that'll be something related to pH or nutes (concentration and/or ratio).
it's early and that's faint at best.. could just be typical growing pains of early leaves and the plant will be more robust in a week that it won't show.... wait and see a tad for sure.. make sure it is getting worse and not just a blemish. if you haven't been pH'in your fertilzied water and your water-only irrigations, do so now... let that clear up first.
if you've been fertilizing the entire pot, the roots are likely hitting some minor buildup where roots did not exist before.. give a good run through of entire pot if you think that's okay, then resume the watering that i suggested above. that'll help dilute it back down, if it did happen..
allow your recent behaviour to elminate anything i suggest or someone else suggests... take the least intrusive routes first, especially when you have plenty of time to figure it out.