Rogaine changing my haircolor??

[Ramazan]

40 days into Rogaine and it's working, only shedding some tiny hairs (not my normal hair, as it is longer). One thing that i (as well as my firneds, family etc) have noticed is that my hair color has changed from dark brown to completly black? Is this somethin to be worried about or is it a sign, that it's working and has added density to my hair hence the black color?