HCG after chemical pregnancy

Ya
Hello, 
When shall I expect the hCG to be out of my system? I had a frozen embryo transfer (2 blastos). I'm 23dpo now and was told on Tuesday that my hCG had sunk. I had 39 at 14dpo,  after 48h only 60 and after 96h it was only 14. I was told to stop all the fertility medication I was taking (4 pessaries + 1 injection of progesterone amongst others). I'm still waiting for the bleeding, but I'm not even spotting yet. 
I used a Clearblue digital HPT this evening just to get an idea of my hCG level and when I finally will start to bleed. I was shocked to see it said "pregnant 1-2 weeks". The sensitivity of this test is 25. How can that be when my beta was 14 on Tuesday?
So I'm wondering how long it takes until the hCG is gone, keeping in mind that it was low from the very start. Could it have actually risen? Or are these tests more sensitive than they officially say?
Sorry if this is all not making any sense. I'm just so exhausted and sad. I just wish to have this bleed and try to move on...
Thanks for reading.