I had a positive OPK on Thursday (only day I tested that month) and DTD that day. The following Monday I had some very light bleeding and DTD again later that day. I had light bleeding through Friday (5 days!) along with some cramping. I took a HPT on Saturday and Sunday (9 and 10 days after positive OPK) - early, I know - and both were negative. Do you think the bleeding was ovulation or implantation? It seemed a little late for ovulation and early for implantation. My periods are irregular and I haven't been temping so its hard to tell. Any thoughts would be really helpful!