When you first heard heartbeat?

Ashleigh
Ok, I'm asking this in reference to my sister. She is 9 weeks I believe and had some bleeding with a little cramping today. It worried her so she went to the ER. They drew blood and did a pelvic exam. The blood work came back fine they said and her cervix is still closed. Then they did an ultrasound and she said the doctor couldn't find the heartbeat. They didn't try with a Doppler (not that I'm sure that would make a difference) but could 9 weeks still be too early to hear a heartbeat? Any help, suggestions or personal stories you could offer would be greatly appreciated. Thanks!