I can't give you an answer as to whether its normal or not - i don't know.
I had aches in that area, which I put down partly due to uterus contracting during breastfeeding, and partly my scar healing as I had a c-section.
If you're at all worried and don't want to make a doctors appt, do you still have the phone number for your midwife, or could you ask your Health Visitor - they both should tell you whether or not you should make a doctors appointment.
sorry I couldn't be more help, but didn't want to read and run.
xxx