USG with color doppler
Ultrasound is an integral part of fertility treatment. It is used for

Basic evaluation of female
To know antral follicle count
To do follicular monitoring when treating infertility to follow growth of follicles & their vascularity.
Salpingo sonography can be done to detect tubal patency
Ultrasound machine assist egg retrieval procedure by guiding the hollow needle to oocytes in ovaries
The formed embryos when transformed in utereus are also done under sonography guidance.
To determine pregnancy and growth of fetus
Ultrasound can detect fibroids , adenomyosis, polyps, ovarian cysts including chocolate cysts and endometrial pathology.
A Doppler ultrasound test uses reflected sound waves to see how blood flows through a blood vessel. It helps doctors assess the blood flow through major arteries and veins, such as those of the uterus, ovaries, and endometrium. During pregnancy, Doppler ultrasound may be used to look at blood flow in an unborn baby to check the baby's health.