Mellow that definitely looks like a positive to me!!! I had my trigger on 29th of oct and had a BT on the 7th to test progesterone & HCG which was at 4. So I definitely don't think it'd be the trigger left in you. Although after experiencing a chemical pregnancy I say be cautiously excited!!
Rainbowbabe - have a look at this website - http://www.betabase.info/showBasicChart.php?type=Single - 10DPO is still very early (even 12DPO for your BT is early I think??) You're not out yet!! What was her progesterone?
Emzy that is so awesome about your extra frosties - what a huge different betwee the results of your cycles! And YAY for AF coming early!!