After an hour in half after eating, i started having lower stomach pain and gas and i pooped and it was normal. i still had the lower stomach pain, then developed belly button and pelvic pain. havent pooped again but the pain gets bad. what is this?

This could be a specific intolerance of what you ate or a manifestation of irritable bowel syndrome. However if abdominal pain is persistent, worsening & especially if there's associated abdominal tenderness, fever or vomiting you should be examined, preferably in the hospital emergency room where prompt attention& testing are available. In the meantime for gaseous discomfort apply heat to belly