water broke?? please help

Please help me! 
I sneezed about a half hour ago and it really hurt my belly, like I actually swore!! 
I then just went to get up off the bed and the sheet was all wet from where I was laying (don't ask me how I didn't notice this) 
I don't know if I peed or if it was my waters. 
I wasn't wearing underwear, I'm just in my night gown.. How can I be sure it wasn't my waters? 
I'm only 30+3 and I live 2 hours away from my hospital