Late Period?

I'm pretty sure I'm not pregnant, I didn't have sex at all (I did do other things like dry humping and all that other stuff) but I doubt that would cause me to be pregnant. However, my period has been about 16 days late. Is that normal when I'm stressed?  I don't want to worry about being pregnant because it's probably a 0.001% chance of happening, but I still worry a bit. Can anyone tell me if that's normal when I'm stressed, or is there an actual possibility of pregnancy if I dry hump with thin clothes , give a BJ , make out , and have him lick down there? (I apologize if I'm adding too much detail, I just want to give imformation so I can get the most accurate answers.)