Is it possible for ultrasound to miss baby?

Question

Is it possible for an ultrasound to have missed a fetus months after having intercourse??? 
When would the baby definitely be seen on a transvaginal ultrasound?

Answer

Should be seen at 6 weeks but I have heard women say on here they couldn't see anything until 8-9 weeks

Answer

Only if it’s super early but starting at 6 weeks , there should be something

Answer

Usually you can see the sac at at least 6 weeks. So if a few months ago was the last time you had sex, you would see the baby by now.

Is it possible for ultrasound to miss baby?

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