My friend had her period for 6 months, well thought it was that. She was several weeks late and kept testing with BFNs. Then she got AF and since it was a typical AF she didn't think m/c and just assumed she stressed herself out TTC causing the witch to be late. 5 months or so later she just felt something was up and her mom was an RN at a OBGYN so she went into to see the doctor, they ran a blood work up and her levels were super high. Since she had just come off AF doctor sent her for an u/s which confirmed she was pg and 6 months or so along (hence the high #s). Her little girl is now a very happy and healthy 8 y/o. They said most likely she O late that month due to stress, which resulted in her getting BFNs because she wasn't far enough out DPO and the bleeding she had during the pg was actually due to a high implantation of the baby and the lower uterus not thinking it was pg. So there is still hope and that you had a late O and/or your body just isn't liking you and allowing HGC to show up in your urine. I would be well ticked having to wait for a blood draw though.