Is the blood bright red? If so, I would go to hospital to get checked. That sounds like a placental issue which can usually be resolved by bed rest/elevating feet and staying inactive for a bit...its always better to get checked if you aren't sure.
Oh, I'm sure that was really scary!! Do as he says and stay in bed. I never had this but some women do get 'bleeds' and everything is still fine. See him tomorrow and let us know what he says!! Hang in there. hugs