I haven't claimed my maternity benefit from SSS and I also haven't filed a maternity notification then when I was pregnant. Can I still claim the benefit? My contributions are complete, by the way.

Are you currently employed or self employed? If employed, you may ask your HR if they can still process it for you even if you haven't filed anything when you were pregnant. For self employed, you may go to the nearest SSS office to ask for assistance. In my case, I just file the Mat2 after I gave birth. Just make sure your Mat requirements are complete so they can process the benefits for you. And yes, you may still claim the benefits as long as your requirements are good to go. You have 10 years to claim it anyway.