I'm having hip pain and minor cramps. Was late starting my period but now on it for 3 weeks. Could it be possible that I'm having a tubal preg?

Maybe. Any woman who is sexually active during reproductive years can be pregnant. A small percentage can have ectopic pregnancies- best step, call your physician, get serum pregnancy test, from there your care can be directed. Avoid drugs and medications or other substances harmful to a pregnancy.