What did your implantation bleeding look like?

I am about 2 weeks over due for my period and I have taken about 3 pregnancy tests since my period was supposed to start. The first one was about 3 days ago and it had a very faint positive line. The other ones I took today but the positive lines were even fainter than the first one somehow. Then a few hours ago around midnight, I was in the bathroom at a bar, (not drinking) and I saw these tiny specks of blood in the toilet when I peed and some quarter sized dots of brownish blood in my underwear. It doesn't look like a regular period because my periods start out strong with lots of bright red blood. I'm wondering if you've had implantation bleeding or a miscarriage, what did it look like? Did it look like what I described?