Thanks for your response! I guess then that it's not so uncommon to have a 'rough' U/S so to speak. I still didn't see the hb, since my U/S was only at 5 weeks, too early for hb. Please G-d, that comes next week. As far as heartrate, my last pregnancy they also just checked for presence of a heartbeat at my 7 week u/s. My feeling is that they kinda 'know' what a nice strong heartbeat looks like, vs. a weak one. They're quite experienced looking at those little hb's, so I didn't worry too much about it.
I think it is natural to worry a little. I try to put scary stuff out of my mind. I know from last time that I worried WAY too much and didn't get to just enjoy my pregnancy enough. I am determined to enjoy more this time around. Hope you do, too

Have a bit of a headache. Going to lie down.
Shari xo