Kellie Gerardi, the astronaut who has been documenting her experience with IVF over the past eight weeks, recorded a TikTok ...

But it might also indicate the pregnancy isn't viable, a miscarriage has already ... that can be seen on a transvaginal ultrasound—usually by five weeks gestational age, but sometimes as early ...

If you have a follow-up ultrasound and there's still no sign of a fetal pole, a miscarriage has likely occurred. In some cases, the empty gestational sac can remain intact for a number of weeks ...