SSS inquiry

Hello mamshieeeesss!!! Ask lang po, plan ko ksi sana mag apply sa sss voluntary kasi sayang ung benefits. 5 months preggy na me October 21 due ko. Ilang months po kaya need ko bayaran para maavail ung benefit ng mat1? And ano need po requirements to apply? Para pag punta ko maready lahat. Anyone po? Thank youuuu.