i have been spotting since last 2 days. Af was supposed to come day before yesterday. I normally spot dark brown blood for 2 days and then start my full blown period. but this spotting since last 2 days is different in amount and color. It is very scant and light brown and sometimes bright red. and I feel I do not bleed while resting but while walking. What should I do. took a pregnancy test 2 days ago. came out negative. going to test tomorrow. could this be implantation ? has any one else experienced this ? I have no previous pregnancy related history. I am scared as I read about ectopic pregnancy having similar symptoms. Please help....