maternity clothing

hi guys I'm currently 22W6D and FTM. currently going out grocery shopping and noticing my favorite band tees r feeling a bit tight:((( I'm curious. when did yall start switching to maternity clothing and where did you guys get them at? (the nice ones I mean) I'm currently freaking out just a bit bc I'm not sure if it's bc my bump is becoming now more prominent or if it's bc I'm gaining unhealthy weight or something idek... has anyone else felt this worrisome about it?