Yesterday morning after I woke up I suddenly saw brown spots on my panties. It was near the butthole and not near the vagina. It did not seem like blood it was very dry and dark brown. And again I saw the the brown spots on panties yesterday evening near the butthole. I dunno what it is. But the urine was clear. Today I did not see any kind of brown spots. And urine was clear again. My First day of previous periods was 18-10-15. I did nt have any kind of intercourse. It was just dry humping with all the clothes on (26-10-15). I was wearing cotton panties jeans pants. Is it pregnancy (brown spots because of Implantation) or some other symptoms? Please help me.