Verses with the word conception in the Old Testament (3 verses):

Genesis 3:16
Unto the woman he said, I will greatly multiply thy sorrow and thy conception; in sorrow thou shalt bring forth children; and thy desire shall be to thy husband, and he shall rule over thee.

Ruth 4:13
So Boaz took Ruth, and she was his wife: and when he went in unto her, the LORD gave her conception, and she bare a son.

Hosea 9:11
As for Ephraim, their glory shall fly away like a bird, from the birth, and from the womb, and from the conception.