Side effects of the nuva ring?

Has anyone had pregnancy like symptoms on the nuva ring? I got mine 4 weeks Pp and since I hadn’t had my first period the dr. Told me I needed to use other forms of contraceptives for a month (right). So aside from the good ole “withdrawal method “ I haven’t done that. I’ve just felt like absolute hell for the last couple days and I can only describe what I’m feeling as pregnancy or the flu. Is this normal?