hi hun well if your stressed that can happen
some times this happens because of hormones i wouldnt worry that much if happens again go to a doctor

it's normal to have late period. maybe it's because of stress or something. when you're in the pool, you wont bleed trust me. i've done it and i've never used a tampon before. it'll stop because of the pressure under the pool.

How old are you? Because if you are just getting your period it is normal for your period to be a few weeks late. And if you been getting your period for years and it is late, than that comes from stress cause stress causes periods to be late. And if you put the tampon all the way in with the string hanging out, than it shouldn't leak, and DO NOT put a tampon in if you don't have your period because that is a risk of Toxic Shock Syndrome which is a rare but deadly disease.

Periods go through a fluctuating stage. It can take months or years for it to even out, your not the only one this has happened to. If you go a few days or months without your period you are not pregnant, your internal clock is just setting itself so do not get anxious. Tampons can be put in when you are not on your period, but can be painful when taken out so be careful if you do. I would recommend using a light or regular tampon RIGHT BEFORE YOU GO SWIMMING!!!! That way if you do start you will be ok. If you go for more than a few hours check to make sure you haven't started in the middle of swimming, make sure you bring a back up. If you have a question just ask me :)