Which option indicates the correct relationship with the risk of early pregnancy bleeding?

The presence of fibroids is recognized as a significant factor associated with the risk of early pregnancy bleeding. Fibroids, which are benign tumors of the uterus, can lead to complications during pregnancy, including bleeding. Their location and size can impact the uterine environment, making it more prone to bleeding, particularly in the early stages of pregnancy.

While increased physical activity and exposure to sexually transmitted infections (STIs) may have implications for pregnancy health, they are not specifically tied to early pregnancy bleeding as strongly as fibroids are. Increased activity might pose risks in certain contexts, but it is not a direct and well-established cause of bleeding. Similarly, STIs can affect pregnancy in a variety of ways, but they do not specifically correlate with early bleeding events.

Therefore, identifying the presence of fibroids highlights a concrete relationship with early pregnancy bleeding that is well-documented in medical literature.