Urgent answer needed!

I went to the hospital last month due to having appendicitis, I was on my period. I healed from the surgery pretty quick though. I am now on my period, day two and I have pain in the same place that they did one of the incisions for the appendicitis (lower right side). What could be causing this? It is not cramps because I do not cramp in just one area, I cramp on my lower stomach and I'm not even cramping, I was yesterday though. Please help me decide what to do!