By day 3, sperm may be meeting the egg and early cell division can begin.
Light cramps at this stage are usually due to hormonal changes, not implantation.
Slight spotting may happen due to cervical irritation after the IUI procedure.
Hormonal medications can cause slight soreness or sensitivity in the breasts.
Fatigue is common because of progesterone and emotional stress after treatment.
Mild nausea can occur from hormonal fluctuations, even this early after IUI.
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