Period came on 5 days early or could it be implantation?

Hi today is june 21st, and my period isnt suppose to come on until the 26 of this month, ive felt mild cramps accompanied by light pinkish blood when i wipe, my period has been very consistent and comes on the exact date each month. Could i be pregnant or is it possible my period just started early? I really hate getting my hopes up but ive been ttc for some time now. Please if anyone had this problem, please let me know. Thanks!