Those situations where Talaaq takes place

Issuing three talaaqs in the absence of one's wife

Q: I constantly have waswasa regarding different things, such as fears of losing important things and intrusive thoughts about divorce. 

Recently, while driving alone, I had thoughts of talaq, and I became worried about accidentally uttering the word and losing my wife. To counter these thoughts, I ended up saying the statement three times "main tumhy talaq deta hon" with my wife's name, thinking it would stop my mind from repeating it in front of her. 

However, I later read that divorce in isolation might still be valid. I also consulted an Imam at the Masjid, who assured me that the talaq is not valid. I would appreciate your opinion on this matter.

Divorcing one wife by saying her name but the another wife's name came to mind

Q: If a person has 2 wives and he, intending to divorce one says her name then explicit words of divorce like "Maryam I....(explicit words)" but at the time of sayings the words he has his other wife who he didn't want to divorce come to his mind.

Does it mean he accidentally gave divorce to the other wife (named Zainab) which he didn't intend to?

Using the word faarigh for divorce

Q: My husband and I were in an argument and both of us were very angry so when I said to him to give me talaq, he said you are farigh from my side but since I didnt know about the meaning of this word farigh, I didn't paid attention to it. After that 5 years passed and I also gave birth to our third baby.

Now, after asking one mufti about this, he said to me that the talaq was valid and when I asked my husband about this, he said I never said that you are farigh, rather I said farigh kardunga. Please help and I also dont remember it very much because years have passed.

Saying "It's done" while discussing talaaq

Q: My husband divorced me once over the phone but made ruju. Later on we had many fights. I asked him for divorce or to end the marriage and he said "ho gayi" meaning it's done, along with many other words that I don't remember. This was in person.

Then at another time after more fights, I asked him to end this and he said, "Samjho ho gayi or ho chuki" meaning consider it done. I wanted him to text me the word talaq but he said I'll send the papers in mail. I gave him the address because he asked. But he couldn't go through with it. Later on, he said since he didn't use the word divorce, it probably didn't occur. 

Divorce during pregnancy

Q: Is divorce during pregnancy halaal? If a husband thinks he cannot move on with his relationship with his wife, can he divorce his wife during pregnancy? Whether yes or no, in either case, please explain when will the iddat terminate.