I had sex and he came in me twice, 7 hours passed and he bought me the pill, i took the pill and felt tired but now the next day i feel sleepy but not feeling awful like other girls i am 5,4 and weight 180 which im scared, im taking birth control but i started this month which hasnt been long thats why i bought plan b. Im really scared and freaking out, how will i know if it works?