em

Wait until your period is due. When you are a day late, buy two tests, and take one. If its negative, wait a week and take the other one.

In the future, you won't have to go through all this horrible fear and stress if you practice safer sex - a condom, and one other form of birth control.

You should read this, it's very informative:
http://www.scarleteen.com/reproduction/birthcontrol.html

SO the best thing to do is take a test 10 days after the incident, if you want to test early, and then test again when your period is late.

it is NOT true that a pregnancy test will not work until your period is late. it doesn't make biological sense.

for more info about this, check out Human Reproduction

Here's a little more about HCG from WebMD: http://my.webmd.com/content/asset/adam_test_serial_beta_hcg http://my.webmd.com/content/asset/adam_test_hcg_(qualitative-urine)
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How can you not like muffins?!

Out of my Head.

EPT can detect hCG hormone levels in your urine as early as the day your period should have started. EPT can be used on the day of your missed period as well as any day thereafter.

Most over-the-counter tests require a level of 40 - 50mlU/ml of hCG to detect pregnancy. This will NOT be detectable until several weeks after you think conception may have occurred.

There are more sensitive tests, but fewer of them make up the popular over-the-counter brands.

Here's a list:
http://www.fertilityplus.org/faq/hpt.html

Bottom line: read the back of the box

So. If you're worried, take the test 10-14 days after the incident, then when you're due for your period. You can't be too sure.

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How can you not like muffins?!