Yes.
This would depend on the use of the condom. If you are using a condom to prevent pregnancy, then no a condom is not necessary. If you need to practice safe sex and you have random sexual partners...
WHAT?! There's no need!! Tampons are for when you have your period ONLY! What on Earth would you need a tampon for if your pregnant?!
Sure! You can also ride Roller Coasters too!
Yes. The pill is not 100% effective. If you have missed a period take a pregnancy test as soon as possible.