Last night I started to spot and this morning it seems like AF is here. I doubt this is ovulation or implantation bleeding because it's red and has clots.... But I'm not heavy just yet. What's odd is that I'm on CD21 of a regular 31 day cycle?! What on earth is happening. I've called my GP and he wants me to have bloods done to test my hormones and possible have an ultrasound if something isn't right. Has this happened to anyone else?