Am. I still super fertile???

I'm 4 months pp from a c section and my husband and I had sex and the condom broke. I'm not breastfeeding and I'm not on birth control. i have had one period since having my son.

so my question is am I still in the super fertile window and can easily get pregnant?

I also think we may have a bad box of condoms because we had sex again this morning and that condom broke to.

How long do the super fertile part last after having a baby??