My wifie is 7 days late. She has taken 3 pregnacy tests and all of them said negative. Could there be a chance where she is pregnant or is it too early to know? She has been having some symptoms such as lower abdominal pain on her right side, she feels a lil queasy throughout the day and night and has a lots gas and burps all day. Her pain on her right side went away. When should we do next? how long before we know she is pregnant?