Randomized Double-blind Controlled Trial of Use of Dydrogesterone in Threatened Miscarriage

Inclusion Criteria: * Age of women from 18-40 years at the time of recruitment (not beyond 40th birthday) * Absence of fever * Gestation less than 12 completed weeks as defined by pelvic ultrasound * Presence of intrauterine gestational sac(s) if an urine pregnancy test is first positive within past 2 weeks * Presence of intrauterine fetus(es) with crown-rump length of \<7mm and no fetal pulsation, or presence of intrauterine fetus(es) with positive fetal heart pulsation confirmed on pelvic scanning Exclusion Criteria: * Age of women \>40 years at the time of recruitment * History of recurrent miscarriage defined as at least three consecutive spontaneous miscarriages * History of known parental chromosomal abnormalities * Heavy vaginal bleeding requiring surgical intervention * Severe abdominal pain requiring surgical intervention * Absence of cardiac pulsation in a fetal pole with crown-rump length of \>=7mm on transvaginal scanning * Use of hCG or progesterone treatment for threatened miscarriage prior to recruitment