Hcg low should I be worried?

Today is 12dp5dt and my hpt isn’t getting stronger. My 9dp5dt HCG was 17.9 and my 10dp5dt was 20.3. My next beta isn’t until tomorrow since it’s the weekend, so I checked to see if an hpt would get stronger from Saturday to Sunday. These tests are 11 and 12dp5dt. What do you think?

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