 [ Symptoms ] the day of my cycle when i wipedx i noticed briht red blood the next day it is brownish color could i be pregnant i have been having unprotected sex with my boyfriend regularly i noticed that the day of my cycle there was bright red blood when i wiped the next day the blood was a darkish brown color im only seeing blood when i wipe [ Disease ] gastric juices in the stomach are bright yellow in most cases so a rapid transport of this fluid along with food can result in greenish stools this is very common in babies who often have a bowel movement as you are feeding them very rapid transport  other causes i do not know the age of this person include various green vegetables green stools are not considered a sign of anything bad