Yes it is possible to be pregnant after using the withdrawal method, you only need 1 drop of sperm to fertilize your egg. So just because you both think he pulled out in time does not mean that some of the sperm did not get inside of you. But don't panic just yet, you may not have had sex at the right time to get you pregnant. I always test for pregnancy with the chemist pregnancy kits which you can usually buy at your local supermarket or chemist, and sometimes they even come in packs of 2 just in case you would like to check again just to be sure. Do this first, if you get 2 positives then chances are you are pregnant, these tests are very reliable now days. If you think you have 2 positives then go to your doctor for a pregnancy confirmation, if you have an unwanted pregnancy then you need to start talking to your doctor and the father of the child about waht your options are. In the mean time, put yourself on the contreceptive pill, and use a condom aswell to protect yourself not only from an unwanted pregnancy but also all those natsy std's that go around.