通勤途中雨が降り始めたので家に傘を取りに帰ったって英語でなんて言うの？

"I went back home to get my umbrella when it started to rain on my way to work " and "While I was making my way to work it started to rain and so I went home to get my umbrella."are adequate ways to explain what happened.

Luckily= this adverb means ''because of good luck. Anyway= I used this word to continue the ''story'' as I interrupted the story by adding the sentence ''I was walking to work''. Wasn't= contraction of WAS + NOT. Shortly= You can use this word if you are referring to a short period of time. For example: ''five minutes''.

You can explain that you needed to turn around, or go back in the opposite direction, in order to get an umbrella on your way to work. Also, saying that you needed to 'grab' something shows that you were in a rush and needed to do it quickly.

Fetch means go for and then bring back (someone or something) for someone. For example "He ran to fetch help"

A) As i was on my way to work it started raining and i had to rush back home to get my umbrella. - on my way to work it started raining and i had to go back home to go and fetch my umbrella. B)I had no idea it was going to rain today i had to turn around to go back home for my umbrella - I was not aware of the weather for the day, when i started walking to work it started to rain and i had to o back for my umbrella. I hope this helps :-)

To double back = go back in the direction one has come. "He had to double back to collect his aunt's medicine." To retrace one's footsteps or retrace your steps = to go back to a place in the same way that you came: "She walked straight past her office and then had to retrace her steps to pick up her handbag." Overlooked = this word is sometimes used a s euphemism for 'forgot.'

I recommend using the second sentence because it's better to apologize first and then explain the situation which caused you coming late, although, both of the sentences have the same meaning.