When it comes to allocating books the book club and First Impression books are treated as one big pool, so if you received a book through either program last month you'd be unlikely to receive another this month. This is because we allocate books based primarily on when someone last received one, so the person who has not received a book for 4 months would usually get priority over the person who received one last month.
In general we're usually able to allocate books to people who have not received one for 3 months (occasionally 4). That's not a hard and fast rule as sometimes there'll be a book that has relatively few requests compared to the number of copies available and then we might be able to allocate a book to someone two months in a row. But it's very unlikely that we would allocate two books to the same person in one month. In fact, the only time this has happened was people last December when we had an unusually large number of books and requests were lower than usual and about half a dozen people ended up receiving two books.
So, as you've probably surmised from this, the chances of you receiving a book this month when you got one last month are low. But keep in mind you do not have to get a book from us to take part in the book club discussions. If you can lay your hands on a copy from somewhere else (bookstore, library, friend) and read it you are more than welcome to join the conversation.