Period usually heavy and cramps. it came light with no cramps and some brown. i have protected sex with condom and pull out method. i am 17.

This doesn't sound: like pregnancy. If anything, it sounds more like a period following a cycle where you did not ovulate. The brown discharge suggests older blood from the uterus, which is often associated with a non-ovulatory period. Continue using a condom for sexually-transmitted infection prevention, but consider even more effective birth control methods such as the pill or implant. Best wishes:)

Do a P.G. test: Do a pregnancy test because condoms alone for contraception fail 15 to 20 % of the time. Condoms combined with a local vaginal spermicide such a VCF are much more secure. The pullout method even with a condom is "risky"" for pregnancy protection.