If your shower is next sat then you should be fine. If you go into labor your dr should try and stop it bc you arnt far enough along. I am 38 weeks 4 days and stay on my feet at least 6 hrs out of the day and have been like that since day one of preg and wouldnt change it. I am an extremely active person and obviously it hasnt made me go into labor sooner. I have never heard of you not being on your feet longer then 30 min after 32 weeks. Would ask your dr about that one bc you can read a million things and they will all say something dif and a lot of it is just silly.
Oh and trust me if you go into labor before lamaz then you will def be fine! Those classes are some what useful but most people dont go by a thing they learned in there bc it is so hard to concentrate on what you learned and you go into your instinct
Im also 32 weeks and am freaking out about being ready too :/ we have some things like the bassinet bottles clothes car seat is coming next week but we're waiting til the shower on the 27th to see what other things we need i dont stand for long periods of time because my feet start hurting and they swell up :'