so I came on my period last friday, which is 10 days ago from now. the most recent friday i came off, then yesterday (saturday) i came back on, but the blood was a very very dark red, towards the night i stopped. i woke up this morning around 10, everything was fine. in the afternoon i got the 'feeling' where you know you've come back on, i instantly rushed home to find dark brown/almost black blood. is this something i should be worrying about as it has never happened before but i do have issues with my period which I see a doctor about?!?!?