Pregnant from Dry Pre-Ejaculation?

Okay so a little over two weeks ago my girlfriend was over (I'm 14 shes 16) and we were kissing and stuff.  At one point I touched the tip of my penis.  I'm almost positive that it was dry, no pre-cum or anything but point is i touched it for about a second or two.  About and hour or two later I fingered her about 3 inches in if that was needed and yea.  My finger touched a lot of things in that 1-2 hours (ex. Couch, clothes, a damp dish cloth, some water, etc.) and yea.  The thing is she has an irregular period and it gets later and later every month she does have it (ex. it was on the first week in January, second week in February, and its March now.) She hasn't had it yet so I'm freaking out at the moment she isn't because she says its impossible along with everywhere else I look saying its impossible.  So all I'm asking is provide me with a little help and yea.  We both are virgins and I'm scared.   Please reply thanks to you all I am never gonna do this again this is too much added stress...

Ps. another reasons she may have missed it is because she lost 10+ lbs in the past month and her last period was very light if that has anything to do with it.

Thanks you all.