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.

Yes, you can. Just make sure you are contanstly paying your contributions. A friend of mine was able to file for her maternity benefit after paying the total amount of contributions for the months she wasnt able to contribute. Just also prepare all of your maternity requirements for a smooth processing of your benefit.