This is not a method of birth control, but something which can be used in an emergecy - for example, if the condom breaks.
There are no safe, effective ways to prevent pregnancy once you've had sex.
Now you can wait and see if you get your period. If you do, you'll want to see a doctor about getting onto an appropriate form of birth control. You may also want to consider getting tested for STIs/STDs, as sex without a condom means you might have contracted something.
If you don't get your period, you'll still want to see a doctor to discuss your options.
Attention: NOTHING on this site may be reproduced in any fashion whatsoever without explicit consent (in writing) of the owner of said material, unless otherwise stated on the page where the content originated. Search engines are free to index and cache our content. Users who post their account names or personal information in their questions have no expectation of privacy beyond that point for anything they disclose. Questions are otherwise considered anonymous to the general public.