We are sorry to hear of your miscarriage.
If you had bleeding prior to the procedure, then that could have already made you
niddah, based on the usual criteria for becoming
niddah. If you did not previously have bleeding, then the D&C procedure will make you
niddah.
In either case, you may perform a
hefsek taharah as early as
day five (with day one being the day on which you became
niddah), but you may not immerse until
fourteen days have passed from the D&C, with the day of the procedure counted as the first day.
The exception would be if it was determined that the fetus was male, in which case you could immerse as soon as you complete your clean days.
Please get back to us with any further questions. We wish you a
refuah sheleimah,
refuat hanefesh and
refuat haguf.