So I had my appt yesterday and when we were looking for a HB, we couldn't find one

I'm 12 weeks now and I feel like I should have heard something. I'm scheduled for an ultrasound tomorrow and I just hope we can get some good news!!
I had a threatened miscarriage at 5 weeks so I'm really hoping we don't lose our little one

**update**
Everything went great!! Saw a beautiful little heart beat and baby was looking great!! Ahhh words can explain how happy and relieved we are!!
Also, turns out I'm a week further along than we originally thought! Thank you all for your support!!
Re: 1st appt yesterday... left worried... **update**
Good luck at your ultrasound, I hope all is well.
Good luck tomorrow, I'm really hoping you find that sweet little heartbeat!
Oct 21/13. Beta 360 @ 16 dpo
Oct 23/13. Beta 749 @ 18 dpo
Nov 24/13. Saw HB (141bpm) & baby wiggle around via ultrasound @ 9w5d due date changed to June 23!!
Dec 6/13. Heard HB (122bpm) via Doppler at OB @ 11w3d
Jan 9/14. Heard HB (124bpm) via Doppler at OB @ 16w3d irregular beat
Jan 29/14. DH felt kicks for first time @ 19w3d
Feb 2/14. Saw baby via ultrasound (quick scan in ER) @ 19w6d
Feb 6/14. Heard HB (126-134bpm) via Doppler @ 20w3d normal beat
Feb 15/14. AS - baby looked great (measured 1w small) and would NOT let us see sex! @ 21w5d
Feb 20/14 3D US - its a GIRL!!!!! @ 22w3d
Feb 27/14. Repeat AS for more pics, HB 124bpm @ 23w3d
Mar 6/14. Heard HB (130bpm) via Doppler @ 24w3d
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