On my 1st day of lmp, my home preg test was neg, and also 3 days later. On 1 week late, I had 2 positive home preg tests. On 2 weeks late, I started spotting which prompted my to get into my dr's office sooner. A urine preg test there came up neg, and the blood test came back a 7. The dr is assuming I either had a "chemical pregnancy" or a miscarriage. How can I tell?