Presence of blood clots
in your vaginal discharge
just before periods is nothing but your menstrual blood in clot form. Your cycles have been initiated few days prior to the last menstrual period. This proves that there is no chance of any pregnancy
. However, in case if you still have not got frank periods yet, try doing an urine pregnancy test once for confirmation.
In case if you continue to have clots in your vaginal discharge suggest you to visit a Gynecologist for further evaluation of excessive bleeding.
Do let me know for any additional information.
Dr. T. Shobha Deepak