You may be going into labor now. CALL your DR like RIGHT now.
it is quite common to feel tender with cesarean scars, some people will always have pain. the baby will also stretch during pregnancy resulting in the pain. unless your doctor has stated otherwise it should still be ok to have a VBAC. besides, a c-section would already be booked for you if you were going to have one (unless its an emergancy c-section) you could speak to your doctor if you are really worried.
You just consult from your doctor.. Thanks