Certainly a little discomfort is normal at two weeks post tummy tuck. This is probably just a normal part of your healing, but I have seen a handful of patients (maybe 4 or 5 in 14 years) who developed spasms of the rectus muscle due to the plication. For them I have prescribed muscle relaxants and it seems to help. The down side is that they can make you a little tired.I recommend you ask your Plastic Surgeon about the problem.Good Luck!
Some amount of pain can be "normal" but also can suggest a problem that your surgeon will need to deal with. I would not want to offer false reassurance without enough info. This is an appropriate question, but on that should be directed to your surgeon.