Originally Posted by
DoulaLC
It's possible, sometimes a urine test will not pick up a pregnancy for several weeks. However, the timing of the sex, just before your period, was probably one of the least likely times to get pregnant. Was the period normal, as in coming when you expected it to, numbers of days the same? Have you ever had irregular periods before? You might just be skipping a cycle....it happens.
Give it another week and see if your period should up or not. Try another test at that time, or see your doctor and ask about having a blood test run.