Im a bridal seamstress, I’m not a sales person so I’m fairly unbiased.
No Spanx, most just push the fat to an even worse place so dresses usually look better without it. Many dresses should be worn without a bra, and if you find the dress doesn’t have the support to make you look fab without Spanx or bra then you are probably choosing the wrong dress.
Timelines are tight right now if you’re getting married this summer. Many designers have a 4-6 month lead time as they don’t have a stock of dresses, they’re made in batches or to order. Smaller designers may have even longer lead times. Months may be counted by a certain date so eg the 15th of the month so if you order on the 16th you’ve missed the cut off and you have an extra month to wait. Some designers have stock so can deliver quicker but then you’re at the mercy of what is available, for instance recently a bride had a choice between the right size but with a corset back (she wanted buttons) or a button back but three sizes too big.
Then you have fitting time, so if your dress is going to take 5 months to arrive you also need 2-3months for fittings. I start fittings 8-10 weeks before the wedding, if you’re unlucky and the good seamstresses are booked up for your wedding date you might need to book for even earlier. Quick turnarounds are sometimes available but will be charged extra!
So they might have been rushing you, or they might actually just be worried you won’t get the dress you love in time for your wedding if you put off buying it soon!
Next time do take someone with you, especially if you will be taking your child. It’s much more relaxed for you if you’re not worrying about your child while trying to choose dresses, and you need the input of someone who can see how the dresses look on you. But ideally not someone who will take over or who has very set ideas about what you need as they can be a pita when they won’t let you consider dresses that look brilliant on you but aren’t to their specific taste!