Iphone 7 restore help

I have an iPhone 7 work phone and I plugged it into mac for first time and it said start as new or back up from latest backup. which was at 11:51 and It was 11:53 so I thought It was a backup for it,So I backed it up, then it restored it to my sisters phone thats titled the same. I need the old content on my work phone back can I undo it to old info?