I blead for half a day on July 24th. Had sex that night no blood. Spotted a little bit the next day and no more. And went through my period with no tampon in except my 1st half day. I'm 23 and this is the 1st time this has ever happened to me. Am I pregnant?

You had a period, all be it light, but a period none the less. Since you're asking if your pregnant I will assume that you've had unprotected sex since your last menstrual period at the end of June (Also assuming that you have regular monthly periods).

There is always a possibility of becoming pregnant when you have sex, regardless of your birth control. Birth control just puts a lot of weight in the "Not Pregnant" category but doesn't close off the "Pregnant" completely. What you will need to do to confirm a lack of pregnancy is to take a home pregnancy test, or wait a couple weeks for your next period. There will be times in your life where you will skip your period for no known reason. Your periods will vary at times for no reason, one month being light and another being REALLY heavy. Common things that affect periods are stress, illness, and some medications.

If all else fails, book an appointment with your OB/GYN.