Narrated Aisha (radiallaahu `anhaa):
(the wife of the Prophet (sallallaahu `alayhi wasallam) We set out with the Prophet (sallallaahu `alayhi wasallam) in his last Hajj and we assumed Ihram for Umra. The Prophet (sallallaahu `alayhi wasallam) then said, "Whoever has the Hadi with him should assume Ihram for Hajj along with 'Umra and should not finish the Ihram till he finishes both." I was menstruating when I reached Mecca, and so I neither did Tawaf round the Ka'ba nor Tawaf between Safa and Marwa. I complained about that to the Prophet (sallallaahu `alayhi wasallam) on which he replied, "Undo and comb your head hair, and assume Ihram for Hajj (only) and leave the Umra." So, I did so. When we had performed the Hajj, the Prophet (sallallaahu `alayhi wasallam) sent me with my brother 'Abdur-Rahman bin Abu Bakr (radiallaahu `anhu) to Tan'im. So I performed the 'Umra. The Prophet (sallallaahu `alayhi wasallam) said to me, "This 'Umra is instead of your missed one." Those who had assumed Ihram for 'Umra (Hajj-atTamattu) performed Tawaf round the Ka'ba and between Safa and Marwa and then finished their Ihram. After returning from Mina, they performed another Tawaf (between Safa and Marwa). Those who had assumed Ihram for Hajj and 'Umra together (Hajj-al-Qiran) performed only one Tawaf (between Safa and Marwa).
Know more about the types of Hajj so it's easier to understand the itsy bitsy details.
Every time I come across this incident, I just marvel at the caring husband that the Prophet (sallallaahu `alayhi wasallam) was. He could have easily told `Aa'isha (radiallaahu `anhaa) to just let it be and make sure to not come for Hajj during her menstruation. He could have been irritated with her. But he wasn't. He didn't say any reproachful words to her ("You and your problems! -_-", for example..). Rather he sent her with her brother especially so she could complete her manaasik. And he reassured her that her missed `Umrah had been covered for. Considerate he was. :)
Taken from: http://ilookilisten.wordpress.com/2013/02/01/considerate-husband-hadith-no-1327/