Short answer: No. There is no Jain scriptural rule that a woman must take a “head bath after the 7th day” of periods.

Traditional Jain practice:

• During menstruation (rajo-darshan), women generally pause temple/puja-related activities.
• After the bleeding days are over, a full bath with head wash (snān) and wearing freshly washed clothes is done before resuming temple/puja.
• The exact count of days is a community/family achar matter (often 3 days with bath on the 4th; in some households 4 or 5). A fixed “7th day head bath” is not a Jain requirement.

Digambar and Shvetambar:

• Both uphold extra cleanliness and pausing ritual worship during menses.
• The specific day to resume (and bathe with head wash) can differ by local/customary practice, not by a uniform panth-wide rule.

Essence:

• Maintain daily personal hygiene as health allows.
• When periods end, do a complete bath with head wash and clean garments before restarting sacred activities.
• Follow your family/upāshraya guidance if they observe a particular count; it is a custom, not a binding Agamic command.

For related guidance:

• What is followed in periods in Jainism
• Why we avoid mandir/puja during periods