Our hypothesis is double insemination will improve pregnancy rates in coh cycles with more than one dominant follicles (>16mm).

Metaanalysis for the effects of double IUI demonstrates that effects of this procedure is not different from single IUI. It is known that nearly 25% of coh cycles is evident by monofollicular development.For this reason it is possible that this monofollicular cycles in the studies could decrease the effects of double IUI.

Inclusion criteria:

1. Patients with unexplained infertility or mild male factor infertility whom admitted to the COH+IUI programme in our infertility unit.
2. Female age <37 years old.
3. Baseline FSH <12 mIU/L
4. Total antral follicle count>6
5. During the first three cycles of COH+IUI
6. Minimum 2 follicles >16 mm at the day of HCG.

Primary outcome:

Ongoing pregnancy rates

Secondary outcomes:

The effects of different coh regimens (CC,FSH,CC+FSH)on the outcomes.

Inclusion Criteria:

• Unexplained and mild male factor infertile patients
• Minimum 2 follicles >16 mm at the day of HCG
• First 3 cycles

Exclusion Criteria:

• Basal FSH >12 mIU/L
• Total antral follicle count<6
• Severe male factor infertility