Welcome to HCM.
You are carrying 6wk plus pregnancy
with subserous fibroid
It is one type of fibroid and more common. It is not harmful to baby.
If size is small, then need not to be much worried.
Follow advice of your doctor and check up as per schedule.
Alarming sign is unusual heavy bleeding during delivery if fibroid size is large. So be careful about that.
Take healthy diet,proper rest and avoid heavy work.