False positive?

So I had an abortion on April 8th. I’ve gotten negative test after negative test, until Monday. I got a faint line. The line is progressively getting darker and I’m getting digital positives as well, when those were negative a week ago. I called to make an appointment, and they said it’s most likely just left over hormones. Would that make sense with the negative tests and lines progressing? They have me going in for blood work every 48 hours and I’m just confused.