Implantation, miscarriage or period??

My period was due last week but it never came and I've never had a problem with my periods being late. I wanted to wait a week to see if my period would start before I took a pregnancy test because I didn't want to get my hopes up. Today out of nowhere I started bleeding.. No cramps but I did have a weird pain in the left side of my pelvis area which has stopped now. It's a dark red but not overly thick but there was a fair amount and I'm still bleeding now. Does anyone have any suggestions on what it could be and do you think I should still take a pregnancy test? Please help ladies!! 😕😕