Sex post partum

Im 6 1/2 weeks post partum. We tried having sex for the first time and I handed him a condom. When we switched positions so he could get ontop and we got going. Mid way through he said he didn't put it on then he used the pull out method. Im freaking out because i know im fertile mertil right now! 😭. I cant afford plan B. I have an almost 2 year old and a newborn. I better not be pregnant again! We just moved back in with my parents because I lost my job for morning sickness 😭😭😭