What is the earliest week a baby can survive outside the womb?

Currently at 23 weeks (just entered 6th month). I am kind of worried dahil cerclage na lang ang nagproprotect kay baby. Ibinalik rin si pessary para to add to protection. Pero nakakatakot na talaga. Kasi kahit close cervix ako, naikli talaga ang cervix ko. I just want to be a mom and pasensya na kayo if nakapagshare ako.