Implantation or period?

I’m on the pill so I know exactly when I’m supposed to get my period and how long my period is supposed to last. Two weeks ago I started what I thought was spotting, it was dark brown almost black. I just assumed it was old blood. Last week I was supposed to start on Wednesday(I start on the Wednesday of my placebo pills every month). Last Monday I spotting only when I went to the bathroom which is unusual for me and the color and texture was not normal for me either. It was light brown and stringy on Monday. On Tuesday I had a tad bit of pink when I wiped. I wore a pad and I only had one spot on it that was no bigger than the size of a dime.it only lasted Monday and Tuesday. And I never got my ‘normal’ period on Wednesday like I normally do. Could that have been my period or was it something else? The first picture below is from last Monday then the second picture is from last Tuesday. I never really bled like I normally do during my period.