Calyx starting to yellow?

Hey guys. I'm a pretty new grower and this will be the longest I've grown. Onto 4 and a half weeks in flower and everything seems to be A-OK expect for one thing. Many of caylxes (don't know the plural term if that isn't right lol) have been turning yellow and the pistils growing out of them have turned a reddish color. They are swollen from what I can tell but I don't know if this will eventually fix itself or something is really wrong? Btw I'm growing out of a one gallon jug and the plant doesn't seem to be root bound by any chance, just older leaves starting to turn yellow. Any help would be gracious

have any pix of the plants senpai?

Thanks for the quick reply racerboy. Everything I described I took a pic of. Don't know if I'm just sketched out or maybe I'm too concerned since this being my first REAL grow. Photos taken on an iPad...you believe that?? Lol