No, this is not possible.
Sperm cannot survive for long outside of the body, if a woman has washed her hands then all the sperm has also been washed away so none would get on the tampon - let alone enough to then impregnate her, also during menstruation a woman is less likely to be fertile so pregnancy risks are a little lower than at other times of her cycle.
Tampons do not cause pregnancy, the fact that a tampon was pushed up inside you have absolutely no relation to pregnancy what-so-ever. If you had sex and ejaculate got into your vagina there is a chance of pregnancy, but as long as you used emergency contraception chances are slim.
probably but why should you be using it since you wont have a period any way.
No.
No. The sperm which will get you pregnant is too far inside of you to be effected by a tampon. It will, however, stop the wet feeling. It is not a good idea to use a tampon for anything except a period as it will dry you out too much and may cause toxic shock syndrome. If you are wet use a pantie pad.
Going swimming won't cause the tampon to get lost in your body. The vagina is a dead end, and the tampon has nowhere to go.
You can't cause a miscarriage by putting a tampon in your vagina. You also can't cause one from a finger, sex toy, or penis in your vagina.
If a tampon has blood on only one side, it is never a cause for concern. It has no medical meaning.
No they do not cause pregnancy.
Cuddling won't cause pregnancy.
No it doesn't cause, prevent or end a pregnancy.
Yes, lithium can cause a false pregnancy on a pregnancy test.
Pregnancy may cause your feet to swell.