Implantation bleeding?

So I took a test at 10 days late with first morning urine and got a bfn I’m now 15 days late. Today I used the bathroom and I notice a tiny stringy blood clot like in the toilet when I got up so I wiped again and checked the toilet paper and it was light pink I figured I was possibly finally getting my period but it’s 9p and still nothing yet? Do you think it could be implantation bleeding & i could’ve ovulated late? ( still no signs of af like I usually do sore breast and cramps)