Contemporary novels about being single as a woman in your 30s/40s

Being single in my 30s I often feel lost because I always hoped I'd have a relationship and kids by now. Do you know any books on being single as a woman in that age range? Dealing with expectations towards life, how they change as things develop etc?

As an example, I really like Dolly Aldertons books because they usually center single people in their 30s.