To understand verses of quran I keep my eyes and mind open and present myself for correction all the time and seek opinions of learned people. This is a the core principle nothing else.
I hope i answered your quesiton 
Your answer is right but the topic under discussion is divorce between husband and wife who have lived together.
It is also my understanding derived from verse 227-228 of Chapter 2 of holy quran. Where the procedure of divorce starts
( MIND YOU this is only my understanding not translation. Where ever you feel i am wrong slap it back on my face and correct me. I will accept it )
When one talaq is announced, Woman you must Observe iddat which should be three periods. If you are pregnant then do not hide it, your period of iddat would end after delivery.
P_G !
You said that iddat should be observed after first divorce. Is there any posiblity that iddat can be skipped if a married woman ( who lived with her husband ) is divorced one time ( ek hi talaq hoi hai ) ? give reference , souce link , verse number of holy quran