First time mum here 29 + 3. Past 4 hours I've been experiencing quite bad lower back pain that spreads to my lower abdomen. It comes in waves every 7 minutes or so and then eases. I have no idea if this is just ligament and back pain that you can expect in pregnancy, or whether this could be preterm labour which terrifies me. I don't think I have any other symptoms. Any help would be appreciated.