When cooking sausage it's normal and okay to eat the pink sausage as long as the sausage is just a little pink inside.
If the sausage is more than just a little pink inside then it's not fully cooked and needs to be cooked some more.
Make sure you only see a little pink and not a lot of pink.
Preferably it's best to cook the sausage so that there are no pink colors to the inside or outside of the sausage to ensure the sausage is fully cooked.
If you eat sausage that is partially raw such as having some pink to it then you may get sick because of bacteria that can be inside the meat.
The bacteria is killed when the sausage or any other meat is heated up hot enough so make sure to cook the meat or sausage all the way through.