Thanks for the query to H.C.M. Forum.
The normal size of uterus
is 7.6x4.5 x3.0 cm , in your case size is large but may be due to two fibroid
, but again this size is normal as varies from person to person.
The thickness of endometrum is 9 mm ( minimum ) for implantation
of fertilized ovum , but in your case it is 20 mm , may be due to approaching period date as you doctor told.
The size of ovaries 4x 3 x2 cm normal , in your case left is small in size, while right is large in size.
The main cause of concern is a cyst ( collection of fluid in sac ) , but important thing is no internal flow of fluid . May be a hard mass , diagnosis can be confirmed by M R I , Ultrasound
as well excisional biopsy
. Consult a gynecologist/ surgeon and get their opinion.
Good luck. Dr. HET