Could I be pregnant!!!

I'm seriously freaking out!! I had a D&C July 10th with twins they were only yolks sacs so I don't think I was far along at all but my HCG levels were high last time they was check was July 3rd and they were 63,000 something and now it's been 3 weeks and 4 day since miscarriage and I'm getting a faint positive!!! I don't want to get my Hope's up but I want to be pregnant. They checked my levels 4 days ago it was 18 and I'm still getting positives!! Could I be!!!