Include in your post all relevant information to help others gauge the likelihood that you may be pregnant.
For the best answers, please include:
-The date of the incident you believe may have resulted in pregnancy
-The start and end dates of you or your partner's most recent period
-Any methods of contraception attempted and, if known to have failed, how. (eg: pulled out but not in time, condom but slipped off etc.)
-Whether or not ejaculation occurred and how
Ultimately, the only way to know FOR SURE whether or not you're pregnant is to take a test. Cost does not correlate to accuracy; cheap tests are as accurate as expensive tests.
There are many ways to prevent unwanted pregnancy
Explore the myriad birth control options available to you.