Hi OP

If you're worried about your vagina being "loose" or "too opened" well for one not true.. like everyone else said the vagina is a muscle. There's a possibility for your muscles to have weakened a little but nothing that can't be fixed. :) You can work out and make your muscles more defined and bigger right? Same for your vagina if you're worried about looseness don't fret there's a solution for that..

On Amazon and at your local sex shop there these small metal? (I can't remember the type of material used to make these. I know it's not actual metal because metal would rust inside of you.) balls that can help you strengthen your pelvic floor muscles. What you do is insert them (there's 2 of them or 1 depending on the design) and you do your kegals to keep them from falling out of you. They vary from weight so you'd have to start out with a light weight and work your way up to the heaviest weight set. Do your your kegals while you have them inside you and bam you'll start to see improvement with your tightness. Very very helpful my fellow Redditor.. my source is actually my experience; I have them myself. I bought them after I had my son and was terrified about being loose or stretched out after having a baby. Lol Which I knew wasn't true but I was still paranoid nonetheless. So I went on Amazon and found the kegal balls and it has been a game changer for me. I've definitely improved my pelvic floor muscles and recommended them to any woman who's worried about looseness. :) You actually don't even need the balls, the balls just add weight and makes you work harder to keep them from falling out of you. You could just do kegal excises without the kegal balls and you'll still see improvement that way also. Hope this helps :)