I don't see how you could think that all that pushing and rummaging around was indigestion!!
Out of five kids I had one who had almost no detectable movement. I kept having to go for ultrasounds to keep track of her. The Doctor told me it was because the placenta was at the front of my belly, effectively cushioning all the kicks.
As far as not showing, I’m going to go for a combination of small baby, tilted uterus, and rock hard abs....