Thanks for query
Your periods is early by 6 days i think.
Taking UNWANTED-72 continuously for contraception
is not advisable, it should be used only for emergency one time intercourse. This may be and only MAY BE a reason for your early periods with decreased amount of blood. Try to follow some other contraception method as condom or oral contraceptive pills
Do check for urine pregnancy
always in case of doubt, the kits are of 50-75 rs and is available in all pharmacy. The procedure is also very simple. U just have to place a drop of urine in the kit and see for the indicator lines. it would be explained well in the catalog.