Baby or Gas?

The big question in our house this week has been "is that the baby or just my digestion?" Paul has been working hard to figure this out. We have begun a nightly ritual which consists of his head on my stomach and me trying to be very very quiet. I'll let him give his side of things since I can't hear what's going on down there. My side is still a little unclear. If I am very very still, and concentrating pretty well, then every once in a while I'll feel the teeniest, tiniest little "pop"... but since I wasn't super attentive to what my body did pre-baby in terms of feelings and sounds in my lower abdomen, I'm not really clear on if this is the baby, or just dinner.