hey hope....
i'm sure the other ladies here will weigh in with their experiences soon!
i haven't heard any tales of incision pain, but cramping can be a part of early pregnancy -- it's usually caused by your little embryo nestling into it's home for the next nine months.
however, i would say, even though you've already had a child and have the experience of a prior pregnancy, it never ever hurts to put in a call to your doctor or her nurse -- if for no other reason than the peace of mind.
have you checked out the pregnancy week by week that we have on the site?
http://www.epregnancy.com/pregnancy/weekbyweek.aspx