Unprotected sex

so today i lost my virginity but we didn't use any condoms. it was kind of a thing in the moment and we had no condoms available. he told me he would pull out and he did. we had sex twice with no condoms so i went to the store and got plan b and took it just in case but i was over the weight limit. does the weight limit matter or is it just not gonna work at all. am i gonna get pregnant??? i'm like 5-10 pounds over the weight limit and my period ended on the 27. Also would having sex twice stop plan b form working? he went to the bathroom after the first time having sex.