first of all do a pregnancy test-clearblue is quite good because if you are pregnant (and it sounds like you arent) it will tell you how many weeks. if your boyfreind is using condoms there is no need for him to pull out and ejaculate into it. You can also buy spermicides to use with condoms if you are extra worried but generally condoms are safe unless you are quite dry or having very rough sex-just make sure you are not dry and the condom should not break
If you did get pregnant-its not the end of the world, it wont doom or ruin you at all, look how many successful and famous people have babies-has it doomed or ruined them? No. And even normal people like us, who have children, it always turns out to be a blessing and we live in a country where there is a lot of help on offer so you wont be left on the scrap heap. Just remember that if you did ever want a baby that its with the right person who is going to support you and be happy for you and help you, and that you have been together for a while. It doesnt matter if the baby isnt planned, but its better to talk things through with your boyfriend about these future things