My minecraft server has suddenly stopped working?

Every day for the last two weeks I have been playing minecraft with my friend just fine. I made the server and it worked it was fine. I don't have a static IP address so every time I reboot the internet I have to portforward again, but that's never been a problem and the server usually works after this, however this afternoon my mother rebooted the internet, so I portforwarded as I usually do but the server isn't working at all, neither me or my friend can connect to the server. How do I fix this?

It is possible your router has a different IP address which also may not be static.

go to whatsmyip.org to confirm its current one.