There are, you cannot deny it. To see your body transformed, to notice the development of the foetus, to feel yourself as the source of life necessarily implies a sensation of fullness, of femininity, in addition to the feeling of participating in the cycle of life: to be born, to live and to give birth.
All this creates an intimate feeling of belonging, of "biological well-being" in the sense of being well, of biology functioning well. That makes us feel very good. Obviously, I am talking about desired and longed dreamed pregnancies, not of unplanned pregnancies or with complications that compromise the well-being of the woman.