No, but they do seclude themselves in the wedding chamber for seven days known as the "seven days of feasting" or "seven days of the bridal week." In biblical terms, 7 years is compared to a week. The number seven pops up quiet a lot in eschatology.
I think you're skipping around a bit. When they are betrothed, they are not officially married, that happens about a year later. That's when they have the ceremony at the seven blessings and actually consummate the marriage.
That's not entirely true. The bible does give several descriptions of the wedding, but since we're generally not familiar with the customs of their time, we miss them. There's lot of difference sources we could you use, biblical, extra-biblical, historical records, and so on two piece together what a wedding was like during that time.