Labor/ Is everything okay?

Yesterday morning I was having slight lower back pain and then I went to an appt. They stripped my membranes for the 2nd time and I did have some spotting later. I was also dilated about 4-5. I had major lower back pain yesterday that was constant/consistent, not stop and go. I was able to fall asleep after a bath but woke up twice with the same lower back pain. This morning when I got up I was laying in bed about to fall back asleep and got a very strong pain in my back and lower abdomen where I couldn’t talk through it. So I took another bath and I have had nothing since. Is this normal or should I be worried? My due date is tomorrow and just hope my baby is okay. Is it possible for labor to start and then stop?