Bad beta levels?

I had an ultrasound at 4w+6d and the doctor said in the notes that there is early ipu but my levels I think are rising too slow I'm 5w+1d today

4/14/19 113.8

4/16/19 194.2

4/20/19 512.2

4/21/19 560.0

4/23/19 630.5