What is the ruling on a couple kissing, embracing, and touching each other's bodies before the first and second marriage contracts? Does that affect the validity of the contract? And what is the ruling on the marriage of a Muslim woman who was married to a disbeliever?

The spouses are obliged to repent to Allah Almighty for the sins they committed before or after their marriage. The mentioned contract is valid if the woman had appointed the mosque's imam or someone else as her representative, and there is no need for a second contract unless she was divorced after the first one. Her falling into sin does not invalidate the marriage. Her womb must be cleared by three menstrual cycles before approaching her. Your marriage is valid, and you both must turn to Allah with sincere repentance.