 [ Symptoms ] why did my period start 12 days early we have been trying to get pregnant i had my period 17 days ago i started my oeriod its brown with some blood my back uurts it doesnt feel normal period vwhy did it come 12 days early [ Disease ] common cold is self resolving condition it may subside immediately within 2 3 days based on your body is defense system treatment for common cold should be avoiding cold exposure taking rest and healthy diet to improve body is immune system