DO NOT DOUCHE! Seriously, as Shawna said your body will cleanse itself. Douching changes the Ph balance of your vagina AND if you douche after sex, all you are doing is flushing what's in there, out. Not the way to go about getting pregnant.

Not douching will have no affect on your getting pregnant.
However, there is the theory that if you are trying to conceive a particular sex, that you use a specific kind of douche BEFORE having sex because of it changing the Ph levels. One kind will only allow the boy swimmers to survive and another allows only the girl swimmers to survive. But again, it's just a theory. And douching, especially too much, can actually be bad for you. I have an aunt who now gets chronic yeast infections from douching too much.
Candace, douching is a way of cleaning out your vaginal canal by flushing (generally vinegar and water) through it. A lot of women douche after AF just to help clean out and freshen up. Generally when you buy douche in the store you get what looks like the bottles that come with hair coloring but it has a long hard plastic tube that you screw onto the top. The tube has holes all through it and when you insert it into your vagina and squeeze the plastic bottle (it's really soft plastic so it's easy to squeeze) the mixture shoots out all over inside of you. Definitely something to do in the shower or on the toilet as it's very messy. LOL