When they thought Ianto might be ectopic, I had the run of blood tests and was booked in for an ultrasound the next day*. Since you'd still be very early on if you are still pregnant, and the baby would still be so very tiny, they can afford to make you wait a couple of days without worry. On their side, at least, I'm sure you're very worried yourself

*Just on a side note, if forgotten it was the next day they did the ultrasound. I've been remembering it as the same night, but it wasn't. Hmm. Funny what things pop back into memory...