1) Why it failed? Need to know the grade of blastocyst and have u done Pre genetic screening of embryo ? What is your age if ur age is above 35yrs then genetic anomalies are common leading to implantation failures.
2) implantation was successful or not we need to see if u were on Inj HCG 2000/5000 IU then it is not implanted but if u have not taken HCG injection post transfer then it had implanted giving u biochemical positive result but it didn't grow further.
3) To plan further i would like to know ow ur previous history whether u had similar losses before or any other natural conception losses etc and then we can plan properly further... plus single blast with genetic screening done if ur transferring success rate with single blast is 40%.
Next Steps
please look in your endometrial lining thickness , vascularity, infection, 3D of the uterus etc before transfer if required u can plan.
All the best 👍
Health Tips
take particle result oriented decisions and not in emotional one