You may need to study and discuss together "The Family: A Proclamation to the World". It helped me on marriage and family "issues". Also, our Prophets have counseled us numerous times on issues with birth control.
First Presidency—Heber J. Grant, J. Reuben Clark Jr., David O. McKay stated:
“By virtue of the authority in us vested as the First Presidency of the Church, we warn our people. . . . “Amongst His earliest commands to Adam and Eve, the Lord said: ‘Multiply and replenish the earth.’ He has repeated that command in our day. He has again revealed in this, the last dispensation, the principle of the eternity of the marriage covenant. . . .
“The Lord has told us that it is the duty of every husband and wife to obey the command given to Adam to multiply and replenish the earth, so that the legions of choice spirits waiting for their tabernacles of flesh may come here and move forward under God’s great design to become perfect souls, for without these fleshly tabernacles they cannot progress to their God-planned destiny. Thus, every husband and wife should become a father and a mother in Israel to children born under the holy, eternal covenant” (in Conference Report, Oct. 1942, 11–12).
First Presidency—David O. McKay, Hugh B. Brown, N. Eldon Tanner stated:
“We seriously regret that there should exist a sentiment or feeling among any members of the Church to curtail the birth of their children. We have been commanded to multiply and replenish the earth that we may have joy and rejoicing in our posterity.
“Where husband and wife enjoy health and vigor and are free from impurities that would be entailed upon their posterity, it is contrary to the teachings of the Church artificially to curtail or prevent the birth of children. . . .
“However, we feel that men must be considerate of their wives who bear the greater responsibility not only of bearing children, but of caring for them through childhood. To this end the mother’s health and strength should be conserved and the husband’s consideration for his wife is his first duty, and self control a dominant factor in all their relationships” (letter to stake presidents, bishops, and mission presidents, 14 Apr. 1969).
Elder Ezra Taft Benson said:
“The world teaches birth control. Tragically, many of our sisters subscribe to its pills and practices when they could easily provide earthly tabernacles for more of our Father’s children. We know that every spirit assigned to this earth will come, whether through us or someone else. There are couples in the Church who think they are getting along just fine with their limited families but who will someday suffer the pains of remorse when they meet the spirits that might have been part of their posterity. The first commandment given to man was to multiply and replenish the earth with children. That commandment has never been altered, modified, or cancelled. The Lord did not say to multiply and replenish the earth if it is convenient, or if you are wealthy, or after you have gotten your schooling, or when there is peace on earth, or until you have four children. The Bible says, ‘Lo, children are an heritage of the Lord: . . . Happy is the man that hath his quiver full of them. . . .’ (Ps. 127:3, 5.) We believe God is glorified by having numerous children and a program of perfection for them. So also will God glorify that husband and wife who have a large posterity and who have tried to raise them up in righteousness” (in Conference Report, Apr. 1969, 12).
President Gordon B. Hinckley said:
“I am offended by the sophistry that the only lot of the Latter-day Saint woman is to be barefoot and pregnant. It’s a clever phrase, but it’s false. Of course we believe in children. The Lord has told us to multiply and replenish the earth that we might have joy in our posterity, and there is no greater joy than the joy that comes of happy children in good families.
But he did not designate the number, nor has the Church. That is a sacred matter left to the couple and the Lord. The official statement of the Church includes this language: ‘Husbands must be considerate of their wives, who have the greater responsibility not only of bearing children but of caring for them through childhood, and should help them conserve their health and strength. Married couples should exercise self-control in all of their relationships. They should seek inspiration from the Lord in meeting their marital challenges and rearing their children according to the teachings of the gospel’ (General Handbook of Instructions , p. 77)” (Cornerstones of a Happy Home, 6).
Sorry, long answer. But hope this helps.