So sorry you're going through this.
I've had 4 pregnancies.
First was natural conception and I had bleeding at 11 weeks. Baby born fine at 40 weeks.
Second was IUI and I had bleeding at 11 weeks and miscarries.
Third was IUI and I had bleeding at 6 weeks and miscarries.
Fourth was IVF and I had bleeding at 9/10/11 weeks. Baby born fine at 38 weeks.
So, in my case I bled in all 4 pregnancies and 2 went full term, the other two ended in Mc.
I think the statistics say roughly the same, that bleeding in pregnancy will in around 1/3 - 1/2nend in Mc.
It seems so much tougher when you have been through the rollercoaster of IVF to have a threatened Mc. It's just not fair.
Often the cause of bleeding in an SCH - a sac of blood in the uterus. I'm pretty sure you have a higher likelihood of this if you have had IVF.
Maybe try and book in for an early scan to help you stop worrying?
Hope you're as ok as possible