Implantation bleeding or not

Hey. I have been getting spotting before my period the last few cycles (up to a week of spotting) like the first image. I took the first image yesterday - day 19 of my cycle. I just took the second image. Came on all of a sudden. I got implantation bleeding when I got pregnant a few months ago which was heavier than this second image, but it ended in a miscarriage. My cycles have been regular at 28 days. I stopped tracking ovulation a few months ago because it was driving me insane. We are currently doing some tests with my OB before seeing a fertility specialist because we have only had the one miscarriage in 12 months of trying. Every cycle I try not to get my hopes up and yet somehow it never works...