I'm very moved by your plea to get pregnant, but I'm wondering why you want a baby at your age. Have you thought about the responsibility involved, the energy required, as well as the level of maturity? I hope so.
However, from your questions, I deduct that you are extremely misinformed about many facts. Since there isn't enough space here to give you all the information you need, I recommend you:
1) read this MedHelp information on adolescent pregnancy:
http://www.medhelp.org/adam_pages/show/2999/Adolescent-pregnancy
2) read this information regarding how fertilization and pregnancy occurs:
http://www.scarleteen.com/article/reproduction/where_did_i_come_from_a_refresher_course_in_human_reproduction
And this on issues for teenagers who wish to become pregnant:
http://www.scarleteen.com/article/reproduction/i_want_it_now
The more you know, the more informed your choice will be. Good luck to you. Dr. J