Fetal Heart Tones and Due Date

Cynthia Flynn's picture
Experts: 

QUESTION

Dear Midwife,
Hi, I have a couple of questions for you. I am a first time mom to be and alot of this stuff is very confusing to me. My first question is I am wondering how far along pregnant I really am? My last period was on September 17, 2008 and when I went for my first ultrasound on November 6, they told me I was 4 weeks and 3 days pregnant...... So, does that mean I was technically 6 weeks and 3 days pregnant but baby was 4 weeks and 3 days pregnant? When I asked the ultrasound guy if my period date x'd out he said yes. But I am a little confused on that.

My other questions are, I had an appointment for an ultrasound on Tuesday November 18 to see the baby's heart beat and we saw it yay!! But the weird thing is he played it out loud for us and it didn't sound like a baby's heart beat to me. I work in an ER as an RN and I have heard lots of fetal heart tones and it didn't sound to me like a fetal heart tone it sounded like mine. The reason I am questioning it is he said it was too slow at only 92 beats per minute and now I am all worried. I guess I didn't think with the baby being only a 1/2 inch big you could hear the heart beat that early?? Is that possible??

My last question is.. The ultrasound guy pointed out a blood clot around the placenta. It was not very big and he said it was cloudy and that was a good thing. I didn't really know what that meant. Now, I am all concerned with there being a blood clot. Is this something that is common to see on early ultrasounds??

Thank you for your time! It is greatly appreciated!!!

ANSWER

The reason you had the second ultrasound is that your first u/s did not match up with your period. The u/s said that the fetus was the size you would expect if you conceived about October 20, consistent with a period that started about October 6 on a 28-day cycle.

What you need to know is whether the baby grew 12 days' worth between the two ultrasounds. If so, that is great news! 92 is not an unusual rate for a fetus that young, and it will probably speed up very soon if the pregnancy is viable.

I'm betting a third ultrasound is scheduled, and you will know more then, but for now, things are ok, not to worry.

-- Cynthia, CNM