If you were using some kind of contraceptives, then it shows that you are rejecting the obvious things. The contraceptive could also show how careful you are overall. The dream could also represent your actual fear of getting pregnant, because of the fear having children or simply not ready for it.

(See Birth control)

…(Condom | Contraceptive device | Diaphragm) To use a contraceptive in a dream means throwing one’s money into the drain, wasting one’s wealth, depriving one’s children from their legitimate inheritance. Using a contracep- tive in a dream also signifies impeachment from office or losing the election or divorcing one’s wife or changing one’s trade….

…— CoronaAustralis means marriage — Corona Borealis means forgiveness and safety — Cygnus means a swan — Grus means departure — Libra means adultery — The Celestial equator means happiness — The Little Bear, the Great Bear, Aquila, Orion, Spica, Arietica or Aquarius among others, if one sees them or owns them or controls them or recognizes their names in a dream, it means befriending someone or marriage to a woman with that name or zodiac sign or character, or it could mean begetting a son. The celestial pole in a dream represents a devout worshiper or a high ranking commander — Pollux means delays — The Ursa Major and Ursa Minor mean pursuit, following, signs of guidance or tracks of moving around — Triangulum means conditions — Vela means confrontation — Viergo means a contraceptive — and Vulpicula means screaming. (Also see Celestial spheres | Dog | Star)…

The birth control indicates the protection you are creating around yourself. The more detailed interpretation of the dream is explained in the meaning of contraceptive.