Hello. I Had IUI On 19th January Morning. And Started

Hello. I had IUI on 19th January morning. And started taking Duphaston from 19th January evening onwards. Today i have completed 13 days of taking Duphaston. When should I take pregnancy test? So that I know I can continue or discontinue Duphaston. Also which pregnamcy symptoms can I expect to have now if I am pregnant? Thank you.