It can be difficult. Being able to tell if you "broke your water" can, at times, be difficult to ascertain. Any question that you may have an amniotic leak should immediately be brought to your ob's attention. Nevertheless, some signs may be a constant trickle of fluid or wetness.
Fluid leakage. If you have liquid discharge, you should notify your physician. Most women's water doesn't break until labor starts, however, sometimes the amniotic bag ruptures prior to labor, and can even occur preterm. Symptoms can include sudden burst of fluid from the vagina, or a chronic watery discharge. Either symptom is concerning and should be reported immediately to your physician.