What if my periods come, or I fall ill, in the middle of a weekly vrat — does it break?

no, the vow is not broken; that week is simply not counted and one week is added at the end.

Weekly vratas run for many weeks, so interruptions are expected, and family practice has a calm answer for them. If your period, illness, a death in the family (sūtak) or unavoidable travel falls on the vrata day, that day is left out of the count. Continue from the next week and add the missed weeks at the end before the udyāpana.

Many women still keep the fast or a lighter diet during periods and simply skip touching the mūrti; a family member can do the pūjā, and you can listen to the kathā or chant mentally. Others rest fully that week. Both are accepted; follow your family’s custom.

Illness is never a fault. The śāstras clearly exempt the sick, so take food and medicine as needed and resume when well. If your situation is specific, Ask Chiluka.

Missed weeks are added at the end · Source: common family practice

Dharma Q&A — vratas, festivals & temples · Ask a Jyotishi your own question