Does the waiting period (iddah) for a wife who uses medication to regulate hormones end after three menstrual cycles occur in a short period, and is it permissible to take her back with a new contract and dowry, or with an oral contract in the presence of two witnesses?

The waiting period (iddah) for a divorced woman who has been consummated with and who menstruates is three qurūʾ, and qurʾ refers to menstruation. The minimum period of purity (ṭuhr) between two menstrual cycles is fifteen days, and medication does not affect this. If the period between each of the three menstrual cycles is fifteen days or more, then the waiting period has ended. Any blood that appears before this minimum period is not considered menstruation but rather istiḥāḍah (non-menstrual bleeding). After the waiting period ends, the divorced woman becomes a non-mahram, and it is unlawful to look at her or be alone with her except through a new contract that fulfills the conditions of marriage. It is not a condition for the validity of the contract that it be written.