Hcg not doubling? 94 hr doubling time between last two draws

Brianna • Mommy to a girl born 9/12/2008.😇 10/26/18. MMC 5/20/19 🤰🏼 🌈 due in April 2020!

So my hcg went from 5,722 at 5+3 to 9,716 at 5+6. Not doubling but it says it has a doubling time of 94 hours which is still within the normal range for those levels but still. My ob didn’t seem concerned but I’m not sure. I have an ultrasound next Monday. Keep me in your prayers please. Any success stories are appreciated.