Hi, may I answer your health queries right now ? Please type your query here..I have a 4 month old baby. I had unprotected sex before my period. I started my cycle, as scheduled, on Sept. 24-29; on Oct. 6 I started to spot (dark reddish brown); that night it looked almost black. the next day it slowed up and picked back up that night. Today, Oct. 8th (and last night it looked similar to a period, but dark brown/red. What could this be a sign of? .