Small thrombus in distal right pulmonary artery should i start taking Xarelto (Rivaroxaban)?

The CT Scan Pulmonary Angio reads “small thrombus in distal right pulmonary artery at its bifurcation as described above minimally comprising the lumen”. My question is should i start taking Xarelto (Rivaroxaban) as prescribed by the doctor or should ask doctor to prescribe more safe drug considering the side effect profile of the drug?