So my boyfriend and I were messing around..

He ejaculated. I was wearing my pajama pants and underwear (he was wearing nothing)..
Could It have gone through the clothes?? My pants were a little wet..

Then maybe 10 minutes later.. after he put lotion on and we talked for a bit, he fingered me.. He's not sure if he touched his penis when he came, and he says since it has been in the air it doesn't matter, the sperm would have died..

Could I be pregnant???
And just so you know, I'm supposed to start my period in 7 days.

I doubt it, you can only be pregnant if the sprem directly penetrates for example if you was completely naked and his penis touched the vagina. As for him fingering you after 10 mins, its very unlikely that the sprem was still there, it dies in a few minutes.
Don't worry! :)