Plenty of folks on VJ have. You’re lucky as it appears you have assets you can use, but for most that’s not an option so they have to go ahead to get a job and/or establish domicile. Plus of course, there are lots that have never lived with their spouse/child/children as they have only ever been in a long distance relationship, and live apart until the spouse visa is granted and they can join them in the US. A lot of people are facing an even longer separation now thanks to the new visa ban too.
You’re also lucky that your spouse is Swedish - so if you did have to be separated she could visit you in the interim, again that’s not an option for a lot as their husband/wife can’t even get a B visa. And the wait for an interview is so much less in Stockholm too. People with a spouse in Nigeria (for example) have to wait ~2 years just for that, and their spouse/child/children may not be able to visit them. So their only option to be together whilst waiting for a visa is to go to Nigeria, but if they’re in a job that only gives them 10 days off a year, that’s one short annual visit together for 4 years or so (and maybe 7 years with the new ban). So you really are in a very lucky position compared to other VJ’ers.
But as above, just focus on the I-864 and the other steps ahead. Get your mother fully versed in what being a joint sponsor will entail (we see people pull out at the last moment sometimes whey they realise), start gathering proof of your assets (and if it’s property in the US, proof that it’s rented and you won’t be moving in to it yourselves). Read the website above carefully so you can make sure you understand each step and what will be required. Then you’ll feel more in control of the process and it’ll hopefully go smoothly.
Best of luck.