Chemical pregnancy- what to expect?

So I tested positive on Friday, Saturday, and Sunday. Then today got a negative test. I called my OB and went for a blood test. Hcg level was 2 (under 5 is considered negative), so I'm guessing that this is likely a chemical pregnancy 😕I have no had any spotting or bleeding at this point. My period is 2 days late. 
Has anyone had anything similar happen? How long did it take for bleeding to start? Any ideas on what I can expect next?