Menstrual cycle is 11 days early and it's light pinkish brownish blood been having unprotected sex could i be pregnant?

Irregular bleeding: Bleeding is not a diagnostic sign that points to pregnancy. Viable pregnancy, in general, stops vaginal bleeding. But, it also does not rule out pregnancy. If your next period does not start on time then you need a pregnancy test. If the bleeding persists something is wrong and you need an examination and evaluation by your family doctor.