The lining of the uterus
is the place where the pregnancy
attaches itself.when the female egg and the male sperm unite they form a zygote
.this matting occurs in the fallopian tubes.from here the zygote travels undergoing a series of changes and reaches the uterus where it attaches itself to derive nutrition from the mother.the ideal linning of the uterus is 8-10 mm.
If the uterus linning is sub optimal chances are that either the pregnancy would not attach itself or even if it does would not be able to derive adequate nutrition and would subsequently cease to grow or willl abort.
Your doctor can recommend you with injections that enhance the uterine linning while conducting parallel ovulation studies.