Levels going up?

Hi so...on Wednesday I had a scan to confirm miscarriage etc. Nothing seen. However because all my tests were coming out positive they diagnosed me with pregnancy in an unknown location. So they took bloods and I had to go back to repeat it.

On weds my levels were 51. Today they’re 63.

They’re slightly confused as obviously there’s no active pregnancy so they’ve asked me to go back again in a week to have another blood test.

Has anyone else had this? What was the outcome?