jeinthiangel,
hmm, how did your friend know foetus drop out after 5days? embbie will continue to develop into blastocyst for another 2-3 days after D3 transfer, then it will start to implant into your uterus. the whole process might take up to 1-5days for implantation. At that time, foetus has not form. even when u are pregnant at week 5, only a sac is form. foetus developed after that.
no need to CRIB for 5days, it will be super terrible. just rest as much as possible to minimise movement. u can still walk ard or sit up straight. just dont have big movements, shld be ok.
some pple are just sitting on sofa watching tv, and still strike. got 1 lady travel to oversea for team building the day after ET, still strike twins. your cervix is closed, as along as your embbies are good qualities and your lining is ok, then implantation shouldnt be a problem.