Thank you for reaching out to us.
We appreciate the sensitive nature of this question.
In a case in which they have not had relations within the past four days, women who usually wait four days in accordance with common Sephardi rulings are permitted to perform a hefsek taharah as soon as the bleeding stops.
In other words, you need not wait.
Please let us know if we can be of further assistance.
We wish you and your husband strength and safety.