Your question is understandable. However, it is based on one important assumption: that the sole purpose of 'iddah (the waiting period) is to determine whether a woman is pregnant. In reality, according to Islamic teachings, this is only one of the wisdoms behind 'iddah—not its only purpose.

If determining pregnancy were the only reason for 'iddah, then with today's medical technology this question would indeed arise. However, Islamic law has several other objectives for 'iddah that modern technology cannot replace.

For example:

1. Honoring the sanctity of marriage and the previous marital bond.

Marriage in Islam is a sacred covenant. The waiting period reflects that it is not a temporary arrangement that can simply be replaced the moment it ends.

2. Providing an opportunity for reconciliation after divorce.

In the case of a revocable divorce (ṭalāq rajʿī), the husband has the right to take his wife back during the 'iddah. This gives both spouses time to calm down, reconsider a decision made in anger, and potentially preserve the family.

3. Allowing a widow time to grieve and recover emotionally.

The death of a husband is not merely a legal matter; it is a profound emotional loss. The waiting period gives a widow time to mourn with dignity and adjust to her new circumstances. It is not intended as a punishment.

4. Protecting lineage and safeguarding pregnancy.

While modern tests can often detect pregnancy, Islamic law is meant for all people, in every place and every era—not only for those who have access to advanced medical technology.

Why, then, is there no 'iddah for men?

This is not because Islam ignores men's emotions. Rather, it is because the legal reasons for 'iddah are different:

- Men do not become pregnant, so questions of lineage do not apply to them in the same way.

- The rulings concerning reconciliation after a revocable divorce are tied to the woman's waiting period.

- After the death of his wife, a man is not required to remarry immediately. If he wishes to grieve, he is free to do so. However, Islamic law does not obligate him to observe a legal waiting period because his legal responsibilities and rulings differ.

Islam does not require every ruling to be identical for men and women. Rather, its rulings take into account their different roles, responsibilities, and natural circumstances. Likewise, men have obligations that women do not, such as paying the mahr (dowry), providing financial maintenance, and supporting the family.

Finally, it is important to remember that a divine ruling is not dependent solely on the wisdoms we are able to understand. As Muslims, we believe that Allah is the Most Wise. Sometimes we understand the wisdom behind His commands, and sometimes we do not. Our inability to grasp every reason does not mean that the ruling has become unnecessary.

Allah says:

«"It is not for a believing man or a believing woman, when Allah and His Messenger have decided a matter, to have any choice in their affair."

(Surah Al-Ahzab 33:36)»

Therefore, while modern technology may assist with one aspect of the wisdom behind 'iddah, it cannot replace all of its purposes. This is why the ruling of 'iddah remains just as valid today as the obligations of prayer, fasting, and other acts of worship. Allah's commandments are based on timeless wisdom, not on changing circumstances.