The reward of 70 times refers to acts of pure ibaadat such as salaah and sadaqah. Nikah does not fall under this category.
However, Allah Ta’ala rewards one according to one’s intention. If the intention is correct and sincere, there is nothing strange in receiving more than 70 fold reward.
There is no specific month preferred for nikah.
and Allah Ta’ala Knows Best
Ml. Imraan Vawda
FATWA DEPT.