It sounds pretty normal. I have had four c-sections (fifth coming up in November) and a few weeks after the first one I noticed the most discomfort after the original "ouch they cut me open". I think it is the nerves reattaching in some way. My other ones seemed to take longer to do that and weren't as persistent. My scar from my last c-section turned pink like you are saying and I thought maybe there was an issue, but it was just fine. As long as it isn't draining anymore and doesn't feel warm to the touch, I would say you are just fine!
Mama and stepmama to DSS1 (18), DSS2 (14), DSS3 in heaven, DD1 (11), DSS4 (10), DS1 (8), DD2 (2) and DS2 (1) and due November 2015!