This does not make everything najis, since one is not aware that they had been in contact with najis things with dampness, or one is sure that a particular thing became tahir and najis without knowing which one was first. In such cases it is considered to be tahir.
The wife is not permitted to have contraception without the consent of her husband, based on compulsory precaution. One should deal with each other to resolve any conflict regarding the issue of pregnancy or any other conflict in a good way as this is the best way for your marriage life.
All sins can be forgiven by sincere repentance. Almighty Allah said: “Despair not of the mercy of Allah, Who forgives all sins. Lo! He is the Forgiving, the Merciful”. Yes, it is recommended to seek forgiveness whenever the committed sins are remembered but should not turn into psychological complication.
If the divorce did not take place according to the Sharia, then in order for it to be valid it must be undertaken in the way prescribed by the Sharia, including pronouncing the formula of divorce. A written document is not sufficient.