Emergency Messanger bag! Will it be here in time?!

SO I ordered a bag Saturday night, and asked for overnight shipping. Now I am hoping it will leave today (Monday) and get here tomorrow (Tuesday) because I am leaving Wednesday at 8 am to go to a different country and I needed this bag last minute. So my question is: Is my bag going to get here on Tuesday or am I just out of luck?
Also, I haven't heard anything from UPS yet (no conformation or anything) so does that mean my bag hasn't been shipped yet?
HELP! :(
P.S. My order number is 5158484, if that helps at all.....