I make out with my friend and that too without protection and after that I realized that we have committed a mistake coz, I am having these symptoms - nausea, headache, pain in lower abdomen and one more thing as we were going through the series of events happening, I noticed an unusual thing as the blood got passed through the vagina, it was tar black and dirty. Please help us regarding the concern as I don't need the pregnancy to haunt both of us as we are not ready for it. If you will guide us regarding it we will be very thankful to you.