Period length change and BC

Awnna

So I started my birth control(BC) the day I stated my period. Cause it started on a Saturday and that’s the day I’m suppose to start my BC. My periods always last 6 days. The 5th and 6th days is when I start spotting. But for some reason my period last only 3 days and the 4 it just completely stopped, no spotting at all. And my whole period was light flow, which isn’t normal. Normally my period is a medium flow border line heavy.

So is it normal for my period to do this when just starting BC or could it be something else.

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