The human body is amazing and at times when you expect to see certain signs to help you interpret it one way, nothing happens. Or better still the opposite. That is the case of pregnancy. There are no two similar experiences whether it is your fist time or a subsequent pregnancy. Not all women experience symptoms and those who do, the symptoms vary in severity depending on an individual. While it may also be nothing more than PMS, the only sure way to determine whether you are expecting is through a pregnancy test and just to for safety measure, seek a second opinion from your doctor.