Embryo slow growth and low heart rate

Trigger warning: Miscarriage talk

I went in for an ultrasound at 6 weeks and 2 days (timing is accurate as this was an IVF pregnancy) last week and baby measured 6 weeks and no heartbeat yet.

I went back yesterday 7 weeks and 1 day and baby is measuring about the same… 6 weeks and 1 day with a low hear rate around 96. The dr also said the yolk sac was measuring slightly larger than the embryo. This is our 8th transfer. We have one live birth (our now 3 yr old), then 5 miscarriages and one failed transfer. I am gutted. I truly thought this was finally our baby.

Anyone have any positive similar stories?