No worries at all, @Berta! 
Reading periods last for 3 weeks with a 1 week review period between sessions- you are very welcome jump in at any point, whenever you have the time! 
As for book reviews- I think you may have already found them, but for anyone else looking to enjoy some book reviews there are some located in:
- The previous books, tombs, and tales challenge
- The recommendations category
- Book Club Session I: Reader’s Reviews
As book club continues, all review posts that are part of the club will be listed in the Book Club FAQ post to make them easier to find! 
Happy reading, reviewing, and blessed be! 