Answer

Yes, you may do Samvatsari Pratikraman on the first day of periods, but the exact practice depends on your family tradition, Jain sangh tradition, and your physical condition.

Explanation

In Jain Dharma, Pratikraman is mainly an inner spiritual practice of repentance, forgiveness, self-reflection, and purification of thoughts, words, and actions.

If you are on your period:

• You can do bhav-pratikraman with devotion and repentance.
• You can mentally recite or listen to the Pratikraman if you are not physically comfortable.
• You may avoid going to the temple or touching sacred items if your family or tradition follows that practice.
• If there is pain, weakness, or discomfort, it is acceptable to do it in a simpler way with sincere feelings.

Spiritual Understanding

The heart of Samvatsari is Michhami Dukkadam — seeking forgiveness from all living beings and forgiving others. Jain Dharma gives great importance to inner purity, humility, and right intention.

So even if you cannot perform the full physical ritual, you can still sincerely do:

• repentance for mistakes,
• forgiveness towards all beings,
• mental recitation,
• and Michhami Dukkadam with pure bhav.

Takeaway

If your health allows, do Samvatsari Pratikraman in the way your tradition permits. If not, do it mentally or by listening with devotion. The most important thing is sincere repentance, forgiveness, and pure inner feeling.