Beta levels- worried

Elizabeth
Okay- so I'm starting to get worried. At 6dp5dt my beta was 29, today at 9dp5dt it was 155. My RE is a little concerned because of the short doubling time. I have another beta scheduled Monday morning. Thoughts ladies? Our last <a href="https://glowing.com/glow-fertility-program">IVF</a> ended in a m/c right about this time in the cycle.. thoughts ladies??