I have been slowly collecting maternity clothes since week 7 - couldn't help myself! My biggest concern was waking up one day and having no clothes that fit, so I wanted to be prepared. I haven't bought new or used clothing for myself in years, so it has been super fun updating my wardrobe. I buy most of the maternity pieces locally off Facebook marketplace ($25 for a trashbag full) and Buy/Sell groups ($5-12 per item including shipping). I've also been hitting the clearance racks in local stores and finding some pretty sweet deals ($4-10 per top).
My jeans have required the hair tie trick since week 10 thanks to bloat. Just in the past week (12), they no longer zip up, so I've moved on to sweats, leggings and maternity jeans. My style has always been form fitting, but I do have several tops that are flowy and bump friendly anyway, so they are bridging the gap. I find maternity shirts SO comfy, that I've been wearing them quite a bit also!
So far, my biggest splurge has been two pair of Blanqi leggings when they were doing a 50% off sale. I LOVE THEM! I'll be buying their support tanks and other pieces as they go on sale.