I had the same experience for the first week or so the pain was definitely worse and different. I think it is definitely due to the needle insertion sites healing but after that it got easier although it is not completely pain free for me now (a month later) especially when I insert dilators 4 and up.

I just keep telling myself that I need to keep going so that soon there will be no pain. The more I work at it the less pain I have because my muscles are stretching out 🙂