Inclusion Criteria:  Couple undergoing In vitro fertilization, Intracytoplasmic sperm injection, Frozen embryo replacement or Frozen Intracytoplasmic sperm injection Age between 20 to 40-year-old Couples who are willingly accepting to participate in the study. Both husband and wife will sign the consent.  Exclusion Criteria:  Women with diminished ovarian reserve (AMH < 1.2 ng/ml or AFC < 7) Women with unilateral or bilateral hydro salpinx Women with bilateral endometriomas Women with adenomyosis Women with large (more than 3 cm uterine fibroid) Women with fluid or polyp in the uterine cavity Women with known chronic endometritis Women with H/O recurrent >2 pregnancy loss or implantation failure Were enrolled in this study before