Are Longer Doubling Times Early Indicators For Miscarriage?

Hi there , I had an ICSI Transfer. Egg collection on Friday 16 January. I had a couple of beta hcg tests done since. I am pregnant, but my doubling time is very long and kept increasing in the last few days. I know that the doubling time is supposed to be 48-72hrs as long as the hcg is under 1200. However - while I am clearly under 1200, I already have a doubling time from 70. I have read that longer than normal doubling times are a strong early indicator for a misscarriage, Can you please look at my values below and say, what you think how likely it is that I am going to have one? day 11 past Ovulation/Trigger: 18 day 13 past Ovulation/Trigger: 73 day 16 past Ovulation/Trigger: 227 day 17 past Ovulation/Trigger: 309 day 18 past Ovulation/Trigger: 499