No, although this concept was discussed many years ago, the position of the uterus does not directly affect fertility.
It is true that sometimes the uterus leans backwards (retroverted uterus) as a result of pathologies that produce adhesions, such as endometriosis, or abdominal inflammatory processes. Since these pathologies are associated with a decrease in fertility, we must be attentive to them in these cases.
However, most retrogressive uteruses are not secondary to pathology, but a natural position that the uterus adopts spontaneously.
Suggested for you: Uterus Tipped Backwards: Causes & Symptomes of Retroverted Uterus.