In this case, we would recommend listening to your physician.
However, if you can time the removal and insertion for shortly after mikveh immersion, that would be best, since you would have more time to adjust before having to count clean days.
Reviewing the laws of stains, as by reading our article "Stains" and "Toilet Paper", should prove helpful in limiting any disruption from the procedure.
Please write back to us with any further questions.