15x8 mm subchorionic bleed seen.

In her week 8th she had just a small drop of blood called as spotting and we consult our regular doctor, that time in TVS it was just external bleeding and no internal bleed and nothing close to Gestational Sac. Dr. told us to increase the intake of Duphoston 10mg thrice a day now onwards. After 15 days we went for USG on 10w 1 d and this time it was investigated that 15x8 mm s/c bleed seen adjacent to internal OS. She told us to take bed rest as Sac has detached little away from placentra which is not a good sign. We already had some mishappeing in the past and don't want to loose our baby this time.As per ultrasound baby is doing well, 180BPM heart beat and CRL length 32mm. She is on complete bed rest and taking Duphoston 10mg thrice a day, folvite once a day and Thyroid Tablet 62.5mg . Is the size of 15×8 mm normal or is there any concern? How can this be eracted and recovered?Does it harm  baby as Dr is saying that it slightly detached so be careful. Need advise on this please help