We are sorry to hear of your miscarriage.
1. Yes, following miscarriage a woman must perform a
hefsek taharah (though she may omit the
moch dachuk), followed by
seven clean days and
mikveh immersion.
2. The
fourteen days are counted from when the main part of the fetus was expelled.
In a case in which there is no clear date for passing fetal tissue, we usually go by the onset of heavy bleeding. In this case, we could not attribute the tissue passing to any time before the morning of the 27th. However, we would assume in your case that the fetus was passed by the 28th, since there is no clear indication to the contrary and you already had significant bleeding earlier. You may immerse on the night of Tuesday 12th July as scheduled.
We wish you a
refuah sheleimah.
Please write back with any further questions.