so i’m on my period and me and my boyfriend did anal. he came on my butt and it dripped down and it’s all over my tampon string and that area. could i be pregnant? i’m also on birth control but i’m worried because birth control didn’t work on my mom. that’s how my little brother got here. we don’t know if it’s because another medication she’s taking messed it up or if it just didn’t work. so could i possibly be pregnant?