Slow rising HCG

Fr

Hi. I had my beta HCG tested on the 15th. First level: 187

Second test was yesterday at 48 hours later and level was 287

That is a 54.3% increase and a doubling time of 76.7 hours :(

I think I am very early into my pregnancy. Only yesterday I got a 2-3 on a clearblue when I got a 1-2 the day before.

The midwife says not to worry too much as I have no bleeding at all and no pain, it is still rising, but I’m scared this pregnancy won’t be viable. Any success stories of slower than average rising of hcg resulting in good outcome?