Right lower abdomen is more likely to be coming from your bowels (intestines) than from your stomach. It's possible that when you are rushed and eat late that you are sucking in a lot of air while eating which is causing increased gas. Your body could also be reacting to the stress that is happening. In other words, the question is is the problem that you are eating later or that you are under more stress? It could be either though the fact that it happens when you sleep in does make it sound more like your body doesn't like to be off schedule.   Right lower abdomen can be appendix though so if it gets severe or if you get a fever you should see a doctor right away.   My two best suggestions are to keep a food/symptom log so that you can see patterns. Perhaps you eat more junk/greasy food when you are rushed.This log will also allow your doctor to see patterns. And, lastly if it continues or worsens then it's time to see your doctor for a full eval to get everything checked out.   Stephanie