After its commissioning in 2018, the Belle II experiment has started registering first physics data delivered by SuperKEKB in 2019. The Belle II physics program focuses on the search for physics beyond the standard model with precise measurements in the flavour sector. The huge targeted dataset and the B-factory particular collision scheme will help to significantly improve the experimental precision on the three angles of the bd CKM unitarity triangle. These measurements are based on time-dependent CP asymmetry analyses for the angles phi1 and phi2, and on the reconstruction of many B and D hadronic decay modes for phi3. In this proceeding article are reported the first look at these ingredients reconstructed with early Belle II data, and the expected Belle II sensitivity on phi1, phi2 and phi3 with more data.