How early do you get signs of pregnancy? none at 6 weeks?

4 weeks: One of the earliest signs of pregnancy is a missed menstrual cycle. By convention, once you miss your cycle you are approximately 4 weeks pregnant. Other symptoms include breast tenderness, fatigue, low energy, sleepiness, and at times nausea. As pregnancy progresses, these symptoms become more apparent. In some women this may be delayed, while others may not experience any.