Covid positive - 8 days completed.

I have given swab test on 30th May and resulted covid positive. I have consulted doctor and he suggested tablets(antibiotics and multivitamin) for one week.  I took those. I have been isolated myself. I don't have any symptoms like fever, cough, body pain or losing taste so far from the day I given swab test. Last 4 days I am feeling very mild cough(only 3/4 times per day). My oxigen level in spo2 is 98/99 even after 15 mins of waking. 3 days ago, my mother is discharged from hospital after 15 days in covid ICU. I would like to join with family and take care of her.  Is it safe now to quit quarantine? Kindly suggest  when can I quit quarantine. I have another question for my mother. She has been taking tablets after discharged. Her oxigen level is above 96 for last 3 days without oxigen mask. But pulse rate is always high. Her numbers are 105, 110, 115, 95, 112. Kindly suggest if its normal.