I am getting persistent back pain. Is this the sign of preterm labour?

It may not be the case. The signs of premature labour includes: either a slow trickle or a gush of clear or pinkish fluid from your vagina or any increase in vaginal discharge, backache, cramps like strong period pains, a frequent need to urinate, a feeling of pressure in your pelvis, nausea, vomiting or diarrhoea. If you experience more than just backache, please consult your doctor for a further assessment