We appreciate the sensitive nature of this question.
We follow the view that a woman may immerse with a filling scheduled for replacement seven or more days following immersion.
That means that the filling scheduled to be removed two days after mikveh creates a halachic issue, and it would be preferable for you to reschedule that appointment for at least five days later. Given the fertility concerns, if the appointment cannot be postponed, then you may immerse with the filling, so long as it fits well and could theoretically stay in for longer.
Please let us know if we can be of further assistance. If you’d like to speak further about fertility and halacha, click here to arrange for a free consultation with a Yoetzet Halacha Fertility Counselor.
This response was updated on 25 August, 2021.