I am around 4-5 weeks along. For the past week, I've noticed when I take my dog for a 20-30 minute morning walk, for the last 10 minutes of it I'm getting some pain under the bottom ribs on my right side. It feels similar to exercising after eating. I haven't eaten breakfast yet when this happens. It goes away when I get home and sit down. It is definitely not heartburn as I've had that multiple times even before pregnancy. I would love to hear if you've had this so early, if you know what it was, or have any suggestions. Thanks!