Hi Julie, just thought I'd mention that most sites dealing with O and cycles in general will tell you that the temp rise will usually come up to 72 hours post O, eg anywhere from the day of O to 3 days post O.
By looking at your chart I would say you O'd between CD14 and CD15, making you 12-13dpo today. The spotting is probably just your period coming early, I have had that happen on 12dpo before as well back in early Feb, 1st cycle after a Chemical pregnancy.
I also had a mc in early March, and thought I was UTD this month, had my usual O cramping between CD15-16 and a temp rise on CD17, then my temps were really low (mostly below the coverline) and went up and down until what I thought was 10DPO (the day before I had some cramping pain for 10-15mins exactly 2 inches below my bellybutton, thought it might be implantation), had all the symptoms of being preg from what I thought was 3dpo onwards, got worse after 9dpo, but still no AF and had a big temp drop this morning and a BFN on a test (I'd be 18dpo today if I O'd on CD16 like I thought I did), so I don't really know what to think at the moment, my whole cycle has been messed up by the mc in march.
I hope you get some answers soon though.