If my period was 5 days late, is it normal to have light pink spotting 3 days after it finishes? Also feels like it is going to start again.

Give it a few days. Light red discharge in the first few days after your period is ok. It is just the end of your period. Give it a few days to see if it resolves on its own. Ibuprofen may help and stop the feeling that you are going to start again.