Northern Cardinal Building Nest

This is definitely the year of the nest. We saw a cardinal building a nest in the crepe myrtle in our front yard, where we've had nests before. I spent a day, off and on, watching her build the nest. She would bring a new piece in, weave it in, then scootch down in the nest and wiggle, I guess to make sure it fit her right. She spent about a day or two doing this (it was well on its way when I saw her). The next day or two, she didn't spend much time on the nest. Then, today, she would come and sit in the nest for several minutes at a time, and then disappear for several minutes at a time. We can't see into the nest, so not sure if there are eggs yet. Here's a video of her building the nest.