No significant differences were observed between the two groups regarding the number of embryos transferred ( 2.5 +0.7 Group A vs 2.4 +0.8 Group B ) implantation rate ( 15.6 % Group A vs 15.2 % Group B ) , pregnancy rate ( 34.3 % Group A vs 36.2 % Group B ) , ongoing pregnancy rate ( 23.4 % Group A vs 23.9 % Group B ) , and rate of extrauterine pregnancies ( 1.4 % Group A vs 1 % Group B ) .