In Jain dharma there is no doctrinal rule that prevents starting a puja or idol worship after a menstrual period. Puja (upasana) is a personal, devotional act aimed at purifying the mind and respecting the Tirthankaras, and it is not described as rendering the idol ritually impure.

Key points:

• There is no universal prohibition across Digambar and Śvetāmbara traditions that you must wait a fixed number of days after periods before performing puja.
• Cleanliness and personal comfort are important. If you feel physically clean and mentally prepared, you may begin your puja.
• Some local communities or families may have their own customs; if you follow a specific guru or temple tradition, you can ask them for guidance, but that is a practice-level preference rather than a core Jain doctrine.

If you’d like, I can share more about how puja is typically performed in Jain temples and home practice, or provide a brief outline of a simple Jain puja.