My period is late. i've had stomach cramps for two weeks, i pass a lot of gas, have little energy, some headaches and lower back pain. am i pregnant?

Take a test...: If you are having sex, then you could be pregnant. The only way to say for sure is to take a pregnancy test. The symptoms you have described can certainly go along with pregnancy, but they are not diagnostic (meaning that they could be related to a number of other things too). Take a pregnancy test and either way, see your doctor.