The following are some low-calorie fruits suitable for pre-pregnancy diet and weight loss: 1. Strawberries: only 32 calories per 100 grams. 2. Blueberries: Only 57 calories per 100 grams. 3. Watermelon: Only 30 calories per 100 grams. 4. Honeydew melon: Only 34 calories per 100 grams. 5. Lemon: 1 per