In Jain Dharma there is no universal, fixed rule about “after how many days of menstruation” you can perform Chandan pooja. Practices vary by tradition (Digambar vs. Shwetambar) and by local guru or temple community.

What you should do:

• Follow the guidance of your own Jain guru or community priest, since they know the local practice you are supposed to follow.
• If your tradition permits after the bleeding stops and you feel ritually pure according to your community’s norms, you may resume the pooja; if your tradition requires a formal cleansing or shuddhi, follow that prescription.

If you want, I can help you check your specific tradition’s guidance or find a page from JainKnowledge that discusses relevant practices.