I'm 4 weeks pregnant and spotting, this has happened before and it led to 3 miscarriages. Should I go to the doc today and be seen or chalk it up to another miscarriage and save on another doctor bill?

See the doctor.

Did you have any testing done after the third miscarriage to find out a possible cause? While some spotting or light bleeding can occur in early pregnancy, without there being anything wrong, with your history of miscarriages, it would be wise to at least call the doctor and let them make the judgement of to go in or not. Usually there won't be anything that can be done this early, other than to take it easy, avoid sex, heavy lifting, etc. unless you were already taking precautions for a known cause.

Hopefully all is well and it is just the pregnancy still getting established. Call your doctor for the peace of mind.

I think... you should check it with the doctor.