I'm a STM, and yeah FTM's are more uptight, but you know what? That's ok!
Having a first baby is a really exciting time. It doesn't mean that subsequent babies aren't also exciting, but the newness and unknown quantity of becoming a Mum are really special. You will never get this time back.
Other people should be more respectful of your things, partly because they're YOUR things, and partly because they should remember what it's like to want everything to be perfect your LO.
Once your LO is here, none of this will matter to you, but I completely get why it matters now.
Hope the rest of your pregnancy goes smoothly!