First grow from day 0, White Widow Auto

Day 15 - All good. Day 16 - Left plant a bit drooping, I've watered it with half a glass of water. I guess it's underwatering because I'm being really careful with water in these first weeks, probably too much. Day 17 - All good, left plant's recovered, it must have been underwatered. With how they're growing I think I'll be safe FIMing at the end of this week. Day 18 - Left plant drooping again, I think it's time I start watering them properly, I'll start with a full glass each and increase from here. Day 19 - Left plant recovered, but only for half a day, in the picture it's drooping again. I'm not really sure what it is, hopefully it'll heal itself? Is that a thing? Day 20 - Same issue but since it's not that bad I'll ignore it, also because I have no idea what I could do. Maybe tomorrow I'll FIM them. Day 21 - We've entered our flowering phase, there's a few pistils here and there and a faint smell. I suppose it's too late to FIM, not really sure if I wanna try some LST, we'll see. It's my first grow from scratch anyway so I wouldn't be too upset at leaving it natural.