if you are an active sss member, submit mat 1.
you can check sss.gov.ph for requirements
if not, check if mahahabol pa amg qualifying months based on your edd.
you can check here https://www.philippinesqa.com/2012/03/what-is-semester-of-contingency-in-sss.html?m=1
note that late payments are not credited for matben