Pregnancy ultrasounds are performed mainly using transabdominal ultrasound.

For many women, especially after 8 weeks gestation, sufficient information about the baby may be obtained with transabdominal ultrasound only.

Presumably, progesterone prepares the endometrium for implantation and maintenance of a pregnancy.

If pregnancy occurs, the production of progesterone from the corpus luteum continues for 7 weeks because of the tonic release of luteinizing hormone (LH) from the pituitary gland.

However, in the early pregnancy, the developing embryo is very small (at 6 weeks gestation, the baby is only 5-9mm long) and a transvaginal ultrasound may be required to get a better image of the baby.

Transvaginal ultrasound is safe and commonly performed during all stages of pregnancy, including the first trimester. Transabdominal ultrasound involves scanning through your lower abdomen.

Gynaecology is the branch of medicine that deals with women’s health issues, especially the study and management of female pelvic disorders.

A pelvic or gynaecologic ultrasound is an ultrasound of the female pelvis.The biochemical markers of endometrial receptivity include endometrial adhesion molecules (e.g.integrins), endometrial anti-adhesion molecules (e.g. mucin 1), endometrial cytokines, endometrial growth factors, endometrial immune markers and other endometrial markers.Studies show that after 7 weeks, the placenta takes over this function.If pregnancy does not occur, menses begins with the demise of the corpus luteum.It examines the female pelvic organs including the uterus (commonly called the “womb”), the endometrium (the lining of the uterus), the cervix and the ovaries.