Plan B & breastfeeding?

Can someone tell me if I can take plan b while breastfeeding? Normally we use condom but of course this time we did not and he’s not sure if he came in me.

I also haven’t gotten my period in two months. I have pcos and took awhile to get pregnant with my current breastfed baby. I really wouldn’t want to use the plan b but I don’t need another baby rn.