Haha, I think you need to give us more clues, mama! Are you asking based on symptoms you're having, or you want to do the old wives' tales thing? A few of us tried the Chinese lunar calendar and the baking soda test (very unscientific, I know!), but honestly the only real answer is the ultrasound at 18-20 weeks, that's when they can usually tell for sure. What signs are you seeing?