Why not just take a pregnancy test??? My friends and I use to all do it together when we were in high school. Whenever one of us thought they might need to make sure, our whole group would take them together to comfort the friend taking it. Also it makes it easier to buy when you're in a group if you're embarrassed or don't want people to think it's for you. Other than that I don't see why so many people try to self diagnose pregnancy. Pregnancy symptoms are common to a lot of other symptoms of different causes.

Usually I would wait about a month of the date when you had unprotected sex (or however the situation may have happened) and then use the test. Usually you have to wait I believe at least two weeks after or before your missed period before it can give you an "accurate" reading. I say "accurate" because they aren't 100% but they work extremely well. I haven't taken one in a while so just make sure you read the instructions.

They're pretty cheap and sell them almost everywhere. And from my experience that fancier and pricier they are doesn't make the darnest difference, they all do the same thing.

Let us know how it goes