Talk to Gynecologist on Discharge In Pregnancy

Is it normal to have jelly-like or stringy bloody discharge during pregnancy? It is dark brown or maroon, happens atleast once or twice every week. Placenta is 3 cm away from OS, everything else is normal as per ultrasound. Patient is mostly on rest with very restricted activity, pelvic rest also. Then why is there such discharge and is it dangerous? Should we be worried?