question: Compared to cohort B, the administration of hCG occurred just prior to embryo transfer on day 5 what was the result of cohort A, hCG application was performed two days before blastocyst transfer,  on pregnancy rates (PR), clinical pregnancy rates (cPR), miscarriage rates (MR), and live birth rates (LBR)?
context: No statistically significant differences were observed in PR (43.1 % vs. 48.7 %, respectively), LBR (28.7 % vs. 35.0 %, respectively), and MR (4.4 % vs. 5.9 %, respectively) after injection with hCG vs. medium.