So I got my ultrasound today. Doc said I was around 6 weeks based on the size, but based on my ovulation date and usual cycle length I think I'm actually more like 5 weeks and 3-4 days. They saw the gestational sac, yolk sac, embryo and heart rate but the heart rate was low, they said...92 bpm. They want me to take progesterone injections. Has anyone had something like this happen? I've been looking up miscarriage rates.