Detection of ovulation
Various strategies used to detect ovulation are urinary Leutinising Hormone (LH) estimation, mid-luteal phase progesterone levels and ultrasound monitoring of follicular growth. However, these tests might fail to diagnose ovulation if not performed at the right time of the menstrual cycle [Ref]. Presence of a regular menstrual cycle is a fair indicator of regular ovulation and chances of anovulation in women with unexplained infertility is rare [Ref]. None of these tests, however, can detect the quality of the oocyte.
Short luteal phase in a regularly ovulating women can also cause difficulty in falling pregnant.