Girls really want to lose weight, after the first birth I couldn't get…

Girls really want to lose weight, after the first birth I couldn't get rid of the extra 5-7 kg. But I took myself in hand and started intermittent fasting. Since January we want to plan the second child, very much want to give birth but at the same time don't want to gain too much and can still follow intermittent fasting? Can you not eat bread, sweets? But to eat properly. (Protein, fats) will be there. Just many say that it is impossible during pregnancy that something should be forbidden. My weight now is 67 kg. Before the birth I weighed 58 ?