The aim of the study protocol will be to compare the efficacy of subcutaneous progesterone (25 mg / day; Pleyris, IBSA Institut Biochimique SA) with vaginal progesterone (90 mg / day; Crinone, Merck Serono) administered during the luteal phase in term of pelvic pain reduction in patients with grade I-II endometriosis and / or endometrioma <4 cm subjected to time intercourses or COS/IUI cycles.

Patients with grade I-II endometriosis and / or endometrioma <4 cm subjected to time intercourses or COS/IUI cycles will be subjected to subcutaneous or vaginal progesterone for their luteal phase supplementation in time intercourses or IUI cycles.

The aim of the study protocol will be to compare the efficacy of subcutaneous progesterone (25 mg / day; Pleyris, IBSA Institut Biochimique SA) with vaginal progesterone (90 mg / day; Crinone, Merck Serono) administered during the luteal phase in term of pelvic pain reduction

Inclusion Criteria:

• Laparoscopic or ultrasonographic diagnosis of endometriosis grade I-II and / or endometrioma <4 cm;
• Menstrual VAS score> 5 cm before the last menstrual period with progesterone treatment
• Infertility for at least 1 year
• Body Mass Index 19 to 30 kg / m2
• Basal FSH serum <15 IU / ml
• Normal levels of serum prolactin
• Normal uterine cavity and fallopian patency

Exclusion Criteria:

• Previous ovarian surgery
• Endocrine disorders (eg polycystic ovary syndrome, thyroid disease, hyperprolactinemia, hypogonadotropic hypogonadism)
• Reduced ovarian reserve (basal levels of FSH> 15 IU / mL)
• Acute or chronic infectious state
• Chronic drug intake, alcohol, or drugs that affect cognitive functions, alertness and / or mood
• Psychiatric disorders
• Kidney or liver diseases
• Male factor infertility

Data will be published at the end of the study.