Thanks for posting your query.
The thickened endometrial lining is good and it could suggest that pregnancy
is in progress,endometrial thickness more than 6-8mm is good for conception. Normally HCG
levels range from 1,100 to 56,500 after 6 weeks.
You may request your gynecologist/obstetrician for getting serial HCG levels tested. Doubling up of the hormone levels in 48-72 hours will show that pregnancy is going on smoothly.
Nothing to worry and stay healthy.
Hope it helps.