I posted last night that we had our first U/S today....so we go into the ultrasound room and all looked great according to the u/s tech. She said everything (gestational sac, yolk sac, and fetal pole) was measuring as it should according to my LMP...she thought she was able to get some faint cardiac activity, which is more than we expected.
Then we go and meet with the OB and said says that the heart rate was very slow for how many weeks I am. The u/s tech noted that the heart rate was 75 BPM...so now I'm confused and I ask what the heart rate should be and she says that they like to see it between 125-175 BPM....now I'm worried!?! I wasn't even expecting to hear any heart beat yet and now my OB says it is slow....what gives?? Any advice or thoughts??
Re: Just got back from first U/S
Hoping you get good news soon, maybe you aren't as far along as you think.
PS, are you a June momma? No biggy- but none of the ladies on this board have gotten to hear the heartbeat yet so I don't think we will have a ton of advice for you.
Honestly? I would listen to your tech, and not the OB.
This is my first pregnancy, but I'm very "educated" in the area just based on the pure fact that I've been reading/researching for years (because that's how I do things). You're lucky you even saw a heartbeat, since you're not even 6 weeks. It's SO normal for it to be slow in the beginning.. and especially at 5 weeks and change! It's not likely to be 170bpm at 5 weeks, you know? It only just started beating. It needs several more days to get faster. Sounds totally normal to me.
*edited to add.. yeah, I don't think you're due in July, either
I'm due the FIRST of the month and I'm not 5 weeks yet... 
BFP #2- 9/2012 (beautiful boy born sleeping @ 20 weeks)