Its definitely not possible if semen is around the area. No intercouse = no possible pregnancy. Are you wanting to conceive? If not are you using protection?

It is not impossible. However, it isn't likely. Anytime sperm is introduced into the vaginal "area" pregnancy is possible. Sperm on fingers, condoms etc..Can all result in pregnancy.
In addition, the fact that you were wearing a tampon at the time significantly reduces the liklihood.

The only way to know for sure is to wait and test at the appropriate time.

Yes you can get pregnant without having sex ...If you get semen near the area or on fingers it is possiable..Sperm can live outside for days ...