Hi mommy! Based sa 3-month injectable mo, kung Oct 20 ang 2nd dose mo, dapat by January na ang next injection mo, so next month na agad! Best to confirm with your OB or clinic kasi sometimes may slight flexibility depending sa brand at schedule nila, pero generally 3 months = around late January para safe. Marami sa amin nag-set ng reminder on our phones para hindi makalimutan hehe!