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It is very unfortunate that you could not succeed even after 3 rd attempt of ICSI. Different labs all over the world have different grading system for embryo. Grade A appears to be of good quality embryo. Do you know the embryo quality during previous failures?? Which day embryo was transferred and what was the cell stage...then I ll be able to answer you precisely. According to your history it appears as implantation
failure. Have you undergone hysteroscopy
for uterine cavity
evaluation?? You can do all your routine activities after embryo transfer
but there should not be any physical or mental stress. You should keep vaginal progesterone
capsules deep inside the vagina and continue all your medicines as instructed. Absolute bed rest is not necessary after ET. Hot or cold shower have nothing to do with implantation. Take care.