Sweat or water break? ASAP!

💖Amanda • Have a 5 year old from my previous relationship. Now married to my true love and baby #2 is due aug 2015
Soooo it's about 102 where i live.... I am wearing a skirt and had on a thong...... I started to feel dribble down both my legs while waiting to pick up my son..... I'm not the smallest person so my question is could it just be sweat or could it be my water leaking?