hi there, your ultrasound
report says that ther is thickning of the endometrial lining which is expected in pregancy but no visible sac as it should be at 6 weeks.So in the absence of a gestational sac
and history of bleeding it is a possiblity that there is spontanous expultion of the gestational sac. It should be followed up with serial beta HCG
levels which if are decreasing gradually go against a viable pregnancy
.Also ultrasound will be able to find a sac if the pregnancy is growing. Ectopic pregnancy means when the embryo implants in any place other than the uterine cavity
and could be potentially dangerous if not detected on time and it could also present as bleeding per vaginum, it can be ruled out by doing ultrasound abdomen. Do get a repeat beta hcg and ultrasound done to confirm intrauterine gestation. Take care.