Slow rising HCG at first- can anyone give me hope?

M • TTC #1 since January 2017...2 rounds of Clomid, Ovidrel and timed intercourse❌❌ IUI #1 ❌ IUI #2 MC at 6 weeks, IVF fresh transfer BFP! 🌈✨💗 Rainbow baby boy born April 2020💙

My numbers were :

10dp5dt- 62

12dp5dt- 77

14dp5dt- 133

18dp5dt-983

The only slow rising beta level was between 10 and 12dpt and it was only about 24% rise. The rest of my numbers are rising appropriately. I’ve had losses in the past with slow rising HCG levels so I’m so paranoid that I’m going to have another miscarriage. This is my third round of FET. I am hopeful since my last blood draw doubled in 33 hours instead of 48. Has anyone experienced very slow rising beta levels at first and ended in a successful pregnancy?