Is a woman sinful if she does not undergo a cervical cerclage operation to preserve her twin pregnancy, and miscarries, knowing that the operation is not guaranteed to succeed and she fears undergoing it?

It is advisable to consult doctors to ascertain the importance of the procedure. If it is necessary and its abandonment would lead to the miscarriage of the fetus after forty days, then performing it becomes obligatory and it is not permissible to leave it, because the fetus has sanctity after it has settled in the womb. However, if it is possible to do without it, then there is no harm in abandoning it. One should supplicate, seek well-being, and continue to follow up with doctors.