First of all, congrats and welcome to the boards!! Being engaged is really exciting, especially those first two or three weeks. If you feel like the stress is getting too much for you, just tell anyone who is stressing you out that you want to simply enjoy being engaged, and that you'll start talking wedding in a few weeks. Ask your mom to please wait on inviting/making any decisions until the two of you can talk about it. Also, your FH and you should have your own discussion about what kind of wedding you want, how big, etc. That way when someone asks one of you what you think, you're both on the same page. Plus, then you won't be put on the spot.
Good luck, and welcome! Em
one of my bigger issues was i hadnt intially viewed it as HER day too. no matter what any ID bride tells you (see freud) it is about making everyone happy and this is a HUGE day for MOB (though don't go overboard with your accomdations to her, just remember to keep some of her requests in mind...) either way, i hope you find a quick resolve. and FYI, i think cloud 9 resumes ont he wedding day 
