Actually yes, it is perfectly fine. Your period actually stops when your in water. I recommend changing back into a pad rift after your done swimming though, and I probably wouldn't swim that long. I hope this helped(:
Not really. But if you're not staying in for too long, I guess so. Try not to squirm too much or fool around as that can misplace the tampon or make you leak too much. Also, make sure you put in a new tampon right before you go into the water! :)
I'm not that age, but no it's not a good idea to go swimming none at all if on period. Unless you want to seriously try to use a tampon and see if that'll help you out while swimming. Just I wouldn't myself it's not a smooth move to try and what if people see a red leakage coming from you?
When ever blood hits water it stops flowing out of wound for what ever reason idk. But when u come out of the water the blood will start to flow again so as soon as u get out make sure to put a towel on u or replace your tampon ASAP