So this is a kind of a update... And what do you think?

I posted before, had a 2 day embryo transfer on 11th of April. I tested everyday since then to see when trigger shot is gone and (hopefully) hcg rises again. So today I'm 11 days post transfer and still bfn. I'm pretty sure it didn't work although I have very much pregnancy symptoms(most likely side effects of medication).

So today I called clinic if I can come to do blood work to stop this medication... All the shots everyday and those blood thinner are driving me crazy if there is no pregnancy that's needed them... They told I should wait until 15 days after transfer to make a test and that in moment it's like a Grey zone where they don't know if it has worked or not... But that seems so long! Work my daughter (only successful pregnancy) I had a very strong bfp 3 days after transfer...

So as you all are experts in this what do you think? Is there a realistic chance that I'm getting pregnant or do they just want to be 1000%sure?