The same goes for if you haven’t experienced back pain up until this point in your pregnancy.
[monbaby.com]
Preterm labor, on the other hand, will present with rhythmic contractions, increased vaginal discharge, breaking of the bag of waters, lower back pain, and cramps of the abdomen
[babymed.com]
Symptoms of preterm labor include contractions, cramps, back pain, or leaking of fluid from the vagina. Preterm labor may result in preterm birth.
[stlouischildrens.org]