Know that you are pregnant or not?

Notice when you've missed your period. Some females track their cycles, and some don't, so you may not notice that you haven't had your period until a little while after you've missed it.

Think back to the last time that you had your period. Attach the timing of your period to an event. For example, were you menstruating when you went on a vacation or when you went to a concert? If you haven't had a period in more than 30 days, and you're sexually active, then you could be pregnant.

If you have an irregular period, then you should test for pregnancy often if you're sexually active. This is especially important if you drink alcohol regularly, smoke or use recreational drugs so that you don't harm the fetus during the first trimester.