Unprotected sex

Hello po mga mii, i hope someone can share their opinion and advices. My husband and I made love today which is in my calendar method says I'm safe. We used condom for safe sex but unfortunately the condom broke but my husband was able to pull out when he cum on me. I'm worried is their a possibility nga ma buntis po ako? I'm not ready to be pregnant kasi I just gave birth 6months ago. I hope someone can give me any advice. Thanks #scared#notreadytobepregnantagain