Drop Everything And Read discussion

I need everyone’s help to find a book that I read last year. The H and h had been in a relationship. He thought She was cheating and kicked her out. (I think she was buying him a birthday gift and met someone in a public place.) She was left penniless. She meets another guy, gets married, and builds a successful business. Her husband dies, or they have an amicable divorce. She always wanted children, and her husband knew this and made a sperm donation, so she could have her family. Unbeknownst to her, a relative of the H works at the private clinic where the h went to get IVF, and he switched the sperm samples from her husband to the H, who hates her guts. The relative tells the H that the h is pregnant with his child. He has her kidnapped, and he is ruthless. He told her that she did it on purpose and that he was going to take the child. She tries to escape several times and ends up getting extremely ill. The relative of the H is a doctor and manages to get her well. the H basically forces have an in utero paternity test. Based on the results, I think he forces her to marry him. The book is a drama train wreck, but I would like to read it again. Oh, the hero may have been Russian.