Ligate/ Tali

Hello mamshie. Can someone help me? My last baby na i gave birth last Dec 2017 i signed the waiver na magpapaligate na ako. Which is sabi nila tali lang kasi I was still 26 that time. D pa pwde ang putol. Now for the 1st time in 2years delay ako ng 1 week. Is there possibility na nabubuntis pa din?