Bleeding in early stage has high risk for miscarriage. I have very little spotting for just one time, the dr. already said that I have high risk. He gave me 2 weeks off to stay home bedrest. Finally, to play safe, I applied for 7-week off without pay (my boss is super nice) and stayed home, laid on the bed or sofa everyday. Also, I went to see Chinese doctor and the doctor gave me some herbal tea (13 tai po actually). Until I was 4-month pregnant, I went back to work and kept visiting the Chinese doctor for 1-2 months. Now, I am 8-month pregnant and everything seems fine.
Most important thing is rest and do not carry heavy stuff. My doctor said my problem was that I have a 1-year-old son at that time and he's not able to walk yet, always sticked to me and asked for being carried. He was 22 lbs at that time. If it's your first baby, avoid carry heavy stuff, even cooking or doing laundry is no good. Walking too much is definitely bad. Take care.