Any knowledge shared would be so appreciated.

I just did my second FET which came back positive.
My first HCG level was 38, the next being 120. I started Clexane for the first time the following day and the day after that I had bleeding. So now today I have just got my BT which has a HCG level of only 157. The nurse told me it was rising, but of course hasn't doubled. Now I still don't know if the bleeding was a result of clexane or if I was losing my pregnancy.
I now have to wait another 2 days for next BT.
Can there be any positive outcome for this? I am just feeling so useless at the moment.

Thank you