What Does This Ultrasound Report Indicate?

my ultrasound findings report shows thus: UTERUS: The uterus is bulky in size,normal in outline and of homogenous myometrial echotexture.The endometrial cavity habours a well defined gestational sac with normal decidual reaction and a yolk sac. GSD = 62.6mm GA = 12 weeks 5 days +/-1week EDD = 21th september,2015 +/-1week fetal pole and heartbeat is seen at this time ADNEXEA : Both adnexae are within normal limits POD : No fluids seen in the POD IMPRESSION : An Ongoing gestation at 12 weeks 5 days +/-1 week A REPEAT SCAN IN 4 WEEKS IS ADVISED. What does this report means. I had a thick blood flows through my virgin and i was afraid i lost the pregnancy before going for the scan. Can you adviced me?