Pressured into buying a ring - did i make a mistake??

Hey everyone.
Fiancé and I went into town today to look at wedding rings as we’ve been looking at loads online but wanted to see some in person.
First place we went into was Peter Jackson and the sales girl was really lovely and helpful, i looked through loads of options and she told me that even though my engagement ring is 18 carat white gold, it won’t make any difference if the wedding ring I get is 9 carat white gold so that’s one way to save some money.
One of the options she showed me was a 9 carat ring with a mix of diamonds and band that I loved but it was way out of budget (£1450 when we told her before we were looking around £1000 for both mine and fiancés)
I had also told her I wasn’t a jewellery person and was going to be happy just with a cheaper plain ring and I liked some of the ones I tried, but she wanted to show me this one to see if I liked the style. Once I tried it on she said she could see how much I liked it and how nice it looked with my engagement ring etc.I did say it was out of budget and she said she would speak to her manager and see what they could do.In the meantime I spoke with fiancé and he said if I really love the ring to go for it and we will make the budget work elsewhereHe found a ring he loved for £295 from them so was going to order that regardless.
She came back and said the total for both rings comes to £1745 but they can do them both for £1570 if we can pay a £200 deposit today to secure the order and then it would leave £1370 to pay when we came to pick the rings up. I still wasn’t sure and wanted to think about it but she said she could see how much I loved it so one way to think of it was: the total for both was £1570, but that divide by 2 was £785 so instead of a pricier ring for me compared to my fiancé it’s like we both got a ring for under £800 and will have it for the rest of my life so the cost divide the amount of years I will wear it comes to nothing.
I ended up feeling a bit pressured and swept up in it all and went for it so we paid the deposit, but now I’m worrying - my 18 carat white gold engagement ring was £500 so it’s 3x as much and it’s a 9 carat gold ring! Plus I didn’t even look round any other stores whilst in town and I could have just got a plain white gold band I would have loved for so much less!!
I know I could have said no and it’s my own fault but has anyone else been in this position and felt a bit pressured then regretted spending so much on a ring??
I’m comparing it to EVERYTHING now - I haven’t actually found a wedding dress yet but was only planning on spending about £1000 or under on it, but it feels stupid to have paid more for a ring then my dress now!!
Fiancé is supportive and said not to worry about the cost and we can make it work, he just wants me to have something I will really love but I just feel so guilty at spending that much.
Sorry for the long bit of a vent/rant…to top it off I’ve just looked on Peter Jackson’s website and I think I found the ring there but it’s £1200 so not sure why I’ve been charged £1450?! 😭