Yea, I do believe that we have a Mother in Heaven as well as a Father in Heaven. Eliza R. Snow wrote a poem that is one of our best revelations that we have a Mother in Heaven — a Mother God who stands next to Father God:

In the heav’ns are parents single?
No, the thought makes reason stare!
Truth is reason; truth eternal
Tells me I’ve a mother there…
When I leave this frail existence,
When I lay this mortal by,
Father, Mother, may I meet you
In your royal courts on high? (O My Father)
I have no clue why it is named O My Father, since she named this poem  Invocation — The Eternal Father and Mother.
President Wilford Woodruff, in a General Conference on October 8, 1893, declared Sister Snow was correct in her revelation in the poem. However, I find it odd that he said we dwelt with the Father and with the Son instead of the Father and the Mother:
With regard to our position before we came here, I will say that we dwelt with the Father and with the Son, as expressed in the hymn, ” O my Father, ” that has been sung here. That hymn is a revelation, though it was given unto us by a woman — Sister Snow. There are a great many sisters have the spirit of revelation. There is no reason why they should not be inspired as well as men. (LDS Conference 1893, Wilford Woodruff)

In an earlier conference, President Erastus Snow said we have a Mother in Heaven as well as a Father:

Now, it is not said in so many words in the Scriptures, that we have a Mother in Heaven as well as a Father. It is left for us to infer this from what we see and know of all living things in the earth including man. The male and female principle is united and both necessary to the accomplishment of the object of their being, and if this be not the case with our Father in heaven after whose image we are created, then it is an anomaly in nature. But to our minds the idea of a Father suggests that of a mother…(LDS General Conference 1885, Erastus Snow)

One of my favorite texts that reveal the godly role of women is in the ancient Christian document called The Pearl, shared by Hugh Nibley:

It starts out, “In my first primeval childhood [he’s in heaven, you see, before he came here], I was nutured [quoting Eliza R. Snow, you recognize] in the royal house of my father with loving care in the midst of abundance and glory.” This is where he came from. “My parents sent me forth from our home in the East… (Hugh Nibley, Teachings of The Pearl of Great Price, p 48.)

As you read further into the poem of The Pearl, Nibley explains how the Mother of Life embraced Adam, the first man–

The first embrace, the aspasmos, (the embrace through the veil which is so important in Egypt) is that which the mother of life gave to the first man as he separated himself from her in order to come down to the earth to be tested. She wishes him luck and hopes he will be able to carry on, covers him with love, etc… (Ibid. p. 52)

The mother of life is the heavenly mother; she is there to send us on our way and greet us on our return. As I was looking for a photo to use for this post I found this one entitled, “After Prayers and the Good-night Kiss” — with this text:

Let me quote here from the Christian En-deavor World, by kind permission, some in-teresting definitions of Mother, viz.:

What is mother ? A gift of priceless worth; A breath of God’s love sent down unto earth. Mother: our name for the angel of love sent by God to the household to guide its members heavenward. Mother: queen of the home,— the center of an influence enduring throughout all time,whose circumference is bounded only by eter-nity. Mother is the one who bears, The one who soothes, and also shares,- All our troubles and our cares. Mother: the soul of the home; the one who understands better than any one else how God feels toward us, His weak and wayward chil-dren. Mother is life’s key of gold, that unlocks the inner temple, where life’s finest essence eludes everything else. (The Three Circles)