Take a test. You should take a home pregnancy test. If you engage in behaviors that puts you at risk for pregnancy (you've had sex recently), an irregular cycle may be the first sign of a pregnancy.

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I am on birth control and my period came as usual but it only lasted about three days, could I be pregnant?

Dr. Steven Warren, George Washington University Medical School Answered Sep. 12, 2014

6 years experience in Family Medicine

Probably not. birth control can cause altered bleeding so it is not unusual for your period to be lighter and for a few days. If you skip a period or if you have a light period and had intercourse 14 days prior to your period then check a pregnancy test soon. Read more...

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