After a miscarriage, you are left with so many unanswered questions.  Isn't it wonderful that our Heavenly Father knew we would need to search for answers.  He left us many comforts within The Word so that we don't have to wonder.  We can know for sure.

Jesus understands your pain. 
Surely he hath borne our griefs, and carried our sorrows...
Isaiah 53:4

Life does not begin at birth; Life begins at conception.
And it came to pass, that, when Elisabeth heard the salutation of Mary, the babe leaped in her womb; and Elisabeth was filled with the Holy Ghost:  And she spake out with a loud voice, and said, Blessed art thou among women, and blessed is the fruit of thy womb.  And whence is this to me, that the mother of my Lord shoud come to me?  For, lo, as soon as the voice of thy salutation sounded in mine ears, the babe leaped in my womb for joy.
Luke 1:41-44

God cares for the unborn.
For thou hast possessed my reins; thou hast covered me in my mother's womb.  I will praise thee, for I am fearfully and wonderfully made: marvelous are thy works; and that my soul knoweth right well.  My substance was not hid from thee, when I was made in secret, and curiously wrought in the lowest parts of the earth.  thine eyes did see my substance, yet being unperfect; and in thy book all my members were written, which in continuance were fashioned, when as yet there were none of them.
Psalm 139:13-16

If you are a Christian, you will see your child in heaven someday.
When David and Bathsheba's son died, he said, "I shall go to him, but he shall not return to me."
2 Samuel 12:23 

You will know each other.
For now we see through a glass darkly; but then face to face: now I know in part; but then shall I know even as I am known.
1 Corinthians 13:12,13