Do the aforementioned divorces take place if the husband utters them in a state of intense anger and then regrets it, or if the divorce occurred after intercourse or with an unserious intention?

The first divorce pronounced by the husband while you were pregnant is an effective divorce. The husband's return to you during the waiting period (iddah) restores you to his bond, and it counts as one divorce. The second divorce did not occur, according to the fatwa of the scholars in the Sharia court. As for the third, it is not considered, because the husband did not initiate a divorce; rather, it was a hypothetical statement.