HCG LEVELS

Sandy

So Wednesday I had my HCG checked an it was a 287 on Friday I had it rechecked and it is 589. But the doctor said “this is rising but not as much as we would hope.” So I go today for more bloodwork. I don’t get it? It doubled I thought that it was perfect! Can someone help explain this to me?? First bloodwork I was 4W 5days & 5W 0 days pregnant with Friday’s bloodwork.