I saw it once where this girl was in good shape, she played soccer and was told that working out and such will mess up your cycle. Her boyfriend, military, was in town...9 months later, she was in the emergency in severe pain...in labor! Throughout the pregnancy she had only gained a minimal amount of weigh...i forget but it was around 5 to 10 pounds. She didn't have any signs like nausea or a baby bump.
Crazy...