Erratic HCGs

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Does anyone have experience with irregular and erratic rises? These are my numbers so far and I’m not sure what to expect.

11dp5dt: 165

13dp5dt: 203

15dp5dt: 309

18dp5dt: 1400

20dp5dt: 1800

I had an ultrasound at 5 weeks and nothing was seen. The doctor said it might be too early. I go again next Tuesday for another ultrasound. I’m preparing for the worst. Any thoughts would be greatly appreciated!