Im a 17 year old, 12 week, pregnant female. So far, everything in my pregnancy has been great, no problems at all and just went for an ultrasound on Tuesday and they said it was all fine. But last night my boyfriend and I had rough sex and now my private area is sore and my underwear were kinda brown. No blood though. Could this be a misscarriage and did it effect my baby or am I over thinking? Please help.