illness, hormonal imbalance, change in birth control, etc. This happened to me after stopping a birth control, so I know how frustrating it can be! If you continue to get negative results but have still missed a period after 45 days, contact your doctor . He/she may want to see you for an exam and take blood work to see what is going on. You haven't missed your period but you are experiencing pregnancy symptoms. This may be a judgment call for you. You have to decide whether or not the 'symptoms' you are experiencing are from a pregnancy, regular pre-period fun, or just a bug. If the symptoms persist more than a few days and you do not get a period, you may be pregnant. If the symptoms seem more like you are just sick and pass after two-three days, you're probably suffering from a stomach bug or virus. Often, depending on the level of hormones in your body, you may feel these symptoms right before you get a period. There are even some women who are so obsessed with being pregnant that every little twitch in their body is suddenly a pregnancy symptom.... You're best bet? Wait until the absence of a period, and go from there. You got your period but you still feel as if you may be pregnant. It does happen, believe it or not, that some women will experience bleeding in the first few weeks (or months!) of their pregnancy and still be pregnant.