Answer

Yes, in Jain Dharma, if today is your 8th day of menstruation and you are physically clean and comfortable, you may generally do pooja, according to many common Jain household practices.

Explanation

Traditionally, many Jain families observe a period of not doing temple pooja, touching religious items, or entering the derasar during menstruation. The number of days may vary by family, gaccha, sampraday, and local custom.

Commonly, after the menstrual period is over and proper bathing/cleanliness is done, one may resume:

• Derasar darshan
• Pooja
• Pratikraman
• Samayik
• Other religious activities

Since you mentioned it is the 8th day, if your bleeding has stopped and you have bathed, it is generally considered acceptable in many traditions.

Spiritual Understanding

Jain Dharma gives great importance to shuddhi — purity of body, mind, speech, and conduct. Pooja should be done with devotion, cleanliness, and a peaceful mind.

Takeaway

If bleeding has stopped, you have bathed, and your family/tradition permits it, you can do pooja on the 8th day. If your family follows a specific rule, it is best to follow that tradition respectfully.