Water bag or pee?

Sarah
This morning I was lying in bed at 4 waiting for my hubby to awake/ and I was having my regular BH- by 5 I got tired of waiting for him so I got up out of bed and noticed a wet spot on my nightie (about the size of a soft ball) I had been lying awake for an hour and I never felt like I peed or aomethint ! So i wondered if maybe my water bag was trickling (I'm almost 38 weeks) so I went to the bathroom and it never happened again, I've had minor Braxton hicks throughout the morning but nothing consistent or major, is it safe to assume that I probably peed a little without realizing it? Or should I be prepared for my full bag of water to burst soon? Anybody else have this happen?