Anything is possible first of all.

Guys emit a little bit of sperm before they ejaculate. There is a substance to lessen the acidity of the urethra since it is used for urine also, it is pretty acidic and would kill sperm if there wasnt something to "soften the blow" (no pun intended). But with this pre-ejaculate there is a little bit of sperm.

However, even in perfect conditions and trying to get pregnant, the chance that the fertilized egg would carry to full term is about 31%. With the tiny amount of sperm that could have gotten into your vagina, they would then have to get past the cervix and then approximately half of them are going to go down the wrong fillopian tube. And thats if youre ovulating and your egg isn't too far down the fillopian tube already.

So the chances are highly unlikely. But do not take that as it cant happen! You can get pregnant almost any way you can think of. You can get pregnant on your period as well. So the main point is to not take the chance but yes, I doubt youre pregnant.

And yeah, sperm isn't going to die by coming into contact with air....Theyre not fish. They dont have gills. If anything would kill them it would be the temperature because their used to living in a buffered environment but sperm can survive for days after being ejaculated. Thats why I hate wikipedia.