doubt it. I mean just because you had less of a period doesn't mean you are Prego. Wait a month and see if you miss your cycle, if so take a test. Also FYI pull out method DOES NOT work. So if you are worried about it get some birth control. It is free. Also if that ever happens again you can get ER birth control. its called emergency contraceptive B. Its a pill you take after unprotected sex to prevent pregnancy. It should not be used as long term birth control. Contact your local public health and you can get free birth control and anything related. Ie, STD check ups, condoms, Emergency Birth Control and long term birth control even if you are underage.