Implanatation spotting after a positive

Ok so I think I ovulated on 11-22. Got a vvvfp on .88 tests on 12-1. Continued to get light positives even today. Period is due today or tomorrow. Dr confirmed with a qualitative blood test that I'm pregnant 12-4. Started progesterone suppositories on 12-4. Woke up to pee next morning and had a tiny amount of tan cm with a few reddish streaks on toilet paper(very small amount). Hasn't happened since. Could that have been the embryo just getting further nestled in? Hope this isn't a chemical bc I haven't gotten a strong BFP yet.