Soil nutrients eventually are eaten up by the plant ofc, let the plant tell you, if you have acces to her daily, just wait to her asking for nutes, they do, at veg they can turn from dark green to yellow green and you can see how the overal leafs/canopy dosen't looks happy, can even go yellow, don't scare if there are dead leafs, much better to let her ask for feed than feed her with no sense, late in mid flowering feed her some PK, if is a fast strain (auto, indica, etc) you can feed some PK a little early in flowering, each strain is different, this why I like soil with at least 30% coco in there with strains that I don'k know, if you need to water more often is more easy to have all under control.
peace.