Irregular spotting and clots?

Anna

Unless it's an immaculate conception there's zero chance I'm pregnant (total virgin), I'm not on BC, and my periods are kinda irregular so my gyno's run tests that all came back fine...

But my period is 12 days late now and I've had spotting that entire time, now with the added bonus of several large blood clots (I'm talking a couple inches wide) passing but still no real flow???

I guess my question is, has this happened to anyone else/is this normal?