IS IT HARMFUL TO HAVE THICK UTERINE LINING BEFORE PREGNANT?Not Specifically.
Some Women Have Thick Uterine Lining and they are worried because during time of delivery it might become harmful
But Uterus with Thick lining is not a bad condition or nothing to worry about .
Most of the times , this situation occurs along with the women's birth and sometimes this problem is occured due to high intake of uterine hormones that closes the uterus and increases the endometrial thickness.
This lining is usually referred to as ENDOMETRIUM and this thickness is medically termed as ENDOMETRIAL Thickness.
A lot of information about this problem is discussed on this website