My ultrasound shows subchorionic hematoma i am 6wk long and i have a history of miscarriages my ob didn't put me on bed rest is these normal?

Yes: Subchorionic hematomas are quite common in early pregnancy, and most of them are absorbed (blood is washed away) within a few weeks. Bed rest is usually not necessary, but pelvic rest may be a good idea (nothing inserted into the vagina)...consider discussing this with your OB. They may want to do a follow up ultrasound in a month or two. Congrats on your pregnancy!