depo and periods

Sie
So I have had the depo for about 3wks now w/no bleeding or spotting. I'm suppose to start my period this Friday, i know they said you'll have irregular bleeding or no periods at all. My question is will I be able to tell if I'm about to get my period or not? Bc my breasts have been hurting alittle more than normal the last few days. TIA!

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