I'm pregnant after an ectopic and it hurts

Holly
I had an ectopic pregnancy in May 2015. Hey were able to repair the tube from the surgery and my husband and I conceived again in December 2015. I'm currently 18 weeks and hey have confirmed that the baby came down the damaged tube which I was originally told wouldn't be able to happen. 
So far the pregnancy has been normal, me and the baby are in perfect health, but as my body is expanding, I am finding that my old incision areas from the surgery HURT. Like bad. Last night I rolled over in my sleep and felt like I had torn my entire left side open. 
Is it normal to have lots of pain when you have a pregnancy after an ectopic? It only hurts in the old surgery areas but it's very unbearable.