LHi... I M,, 25 Years Of Age. I Never Had

LHi... I m,, 25 years of age. I never had sex for the past 3 years. I had prolonged periods 2 months, they stopped on the 21 of march, then i had unprotected sex with my boyfriend after hours i started releasing brown discharge and letter dark brown, the discharge lasted for 2 days then after 6 days my periods started and now I have stomachccrumps. My periods started two weeks early m i pregnant?