Unless you really overcook a bird, you will often find a few pieces of meat very close the bone that might have some residual pinkness. Not too much to worry about especially if the meat you ate was fully cooked (with no pinkness).
Another testing tip when checking the thigh meat for doneness, is to make sure to pull the leg right back to expose the joint where the leg meets the carcass. It should pull away from the joint quite easily. If there is still a lot of resistance, then it is not cooked right to the bone. You can see it best in this video for
"How to carve poultry". Note the second leg how easily it pulls from the main carcass.
Don't worry about it too much. I'd suggest quickly re-heating the chicken in the soup or poaching it quickly in stock to bring the meat back up to a safe temperature before eating the leftovers (above 160 degrees or until the pinkness has gone away). By the way, even for cold salads, I often poach left over chicken pieces to warm them as the poaching process really makes the meat tender and moist after sitting in the fridge.