You can’t tell if you’re pregnant based on the symptoms of back pain; there are several factors necessary to try to determine pregnancy. For example, women of childbearing age who have a history of menopause while having sex can be tested with an early pregnancy test. If two red lines appear it means pregnancy. Or go to the hospital for a blood test for human chorionic gonadotropin and progesterone, if these two values are significantly elevated, it also indicates pregnancy. You can also go to the hospital for an ultrasound, if you find a pregnancy sac-like echo in the uterine cavity, it also indicates pregnancy. Symptoms such as back pain may occur after pregnancy, but the presence of such symptoms is not an indication that it is definitely pregnancy. So if you want to determine pregnancy, the results of the laboratory tests must prevail.