In Mark’s gospel, the application of “the unforgiveable sin of blasphemy against the Holy Spirit” is clearly stated. There were certain religious leaders who looked at Jesus and all that he taught and all that he did and still said “he is possessed by an evil spirit.”
They saw the example of all that is good and called it evil. They stood in judgement of God and condemned God. That is the most certain way to incur God’s condemnation.
In other places, Jesus clearly states that God’s condemnation is incurred most certainly by those who practice condemnation - not for the commission of any particular sin. “If you forgive others their sins, then your heavenly Father will forgive yours. If you do not forgive others their sins, then your heavenly Father will not forgive yours.”
Every abortion is a tragedy. every loss of an unborn child for any reason is a tragedy. If there was something you could have done to prevent it then you have reason to ask God’s forgiveness and should be very careful about standing in judgement of others in similar situations. If there was nothing you could have done then there is no sin to forgive.
Peace to you and your family