Women planned to undergo blastocyst-stage embryo transfer after IVF/ICSI were randomized into 2 groups:

• group I: women who had only good-quality embryo transfer.
• group II: women who had both good-quality and poor-quality embryo transfer.

primary outcome was ongoing clinical pregnancy rate

Inclusion Criteria:

• women undergoing primary IVF/ICSI cycles for tubal factor/unexplained infertility and had blastocyst-stage ET

Exclusion Criteria:

• cleavage-stage ET.
• women who had no good-quality embryos to transfer
• women who had known poor endometrial receptivity