Should I call my doctor??

I'm 27 weeks today, and this morning after I had went to the bathroom and wiped and everything a clear liquid dribbled down my leg, and I smelled it and it didn't smell like urine or anything, and I felt down there and I felt almost like I was "wet". It just happened to me again, and my aunt (that's a nurse) said I could be leaking amniotic fluid??? I felt kinda crampy after the first time it happened and now I'm feeling crampy off and on.. Any advice?