I am 21 week pregnant. Recently i m diagnosed with low lying placenta near os. Due to that vaginal bleeding/spotting occurs (1-2 times a day while urinating) since 2 jan 2020 morning. We had a ultrasound scan same day and nothing was concerned. It was suggested that bleeding may occur and advised to take rest. It's happening since 3 days so i am concerned. How long it may happen ? How much bleeding is normal ?