Plan b pill and more

Hi. so about a month ago i took the plan b pill. i only took it because my boyfriend thought he released in me and so we rushed to the pharmacy to grab the pill and i took it within an hour the incident. and so a few days later i started bleeding and so i read up on the plan b pill and it restarts your period cycle. so i had that for about 5 days to a week. and after i was done bleeding my boyfriend and i had sex again. and the dumb thing was we did it without a condom. yes i know that was really dumb of us. he didnt release in me but im afraid that i might be pregnant. ive been having stomach pains starting form my left side and its spreading to my back and did i mention that they're sharp pains sometimes. my lower back kills me and ive been having really bad headaches, ive been sleeping a lot and craving for food. can somebody please help me? i really need somebody to talk to about this. how long does it take to officially know that you're pregnant? im only 17 and i feel lonely. like nobody understands my pain. if anybody would like to help me out and would want to get a hold of me you can find me on facebook nina ounn. or my AIM is NinaOunn. Im online usually 3:30 eastern hours. thank you so much for those who are willing to help me out.