Multivitamin Will Boost Your Chances to Become Pregnant Fast. Nutrition plays, not only in your overall health, but in helping you become pregnant fast. Healthy foods like fruits, whole grains and vegetables are the best sources of all the natural goodness we need. However, it’s impossible to have a healthy dose of all the essential vitamins and minerals on our daily diet. That is why it is wise to take a multivitamin most especially if you want to prepare your body for pregnancy.