If the congregational prayer begins while you are performing Sa‘i, stand in the row and offer the prayer.
If you become tired while performing Sa‘i, sit down and rest. This will not affect the validity of the Sa‘i.
Complete the final Sa‘i—that is, the seventh Sa‘i—at Marwah.
Wudu is not a condition for Sa‘i. However, it is recommended to be in a state of wudu or purity.[1]
If a woman begins menstruating after completing Tawaf, she may perform Sa‘i.
[1]. Fatawa Ibn Baz: 5/264.