shame over having sex?

so im 16, just lost my virginity to my boyfriend who i love very much. i dont regret having sex, i had thought it through for a while, made sure he knew my boundaries, and made sure that we were on the same page about pregnancy and stds. however, ever since it happened, ive been scared for it to happen again. i enjoyed it and it was a good experience, but i feel weirdly shameful for having sex. i feel like a slut and i guess its just been so engrained in my brain by my mom that if i have sex im gonna get pregnant and my life is gonna be over. my mom has even talked to me saying “if you get pregnant i will physically harm you”, she doesnt seriously mean it, ik she would never hurt me, but i just feel so shameful. i want to be able to have sex again, but im just so scared and i dont know why. any advice?