conception date

Can You Date Conception From Ultrasound Data?

Jane Foley's picture

QUESTION

Hi Ms. Ultrasound,

I hope you can help me with my question as it would really ease my concern.

I am 31 weeks pregnant; the first day of my last menstrual period date was 26 July 26, 2009 and my usual length of menstrual cycle ranges between 28 to 30 days.

I had unprotected sex on August 6th (Day 12) and August 17th (Day 23). I really need to know whether the baby was conceived on the 6th, or the 17th.

Here are the information of my early fetal ultrasounds:

Pregnant December or January?

Cynthia Flynn's picture
Experts: 

QUESTION

Dear Midwife,
I just found out I was pregnant 2 weeks after being diagnosed with Diabetes.

I remember having a slight period in December (not sure what the exact date was, but it's usually around the 13th) and I didn't get my January period. My husband and I had been trying to have a baby, so we were excited with the news.

However, at my first prenatal appointment they explained to me that gestational diabetes leads to a large baby. They told me I was 9 weeks, 3 days at my appointment based on the size of the baby on the ultrasound.

Can an Early Ultrasound Be Off By 4 Weeks?

Jane Foley's picture

QUESTION

Dear Ms. Ultrasound,
I have a history of irregular cycles (and diagnosed with PCOS), so using my lmp to date my pregnancy was not an option. My LMP was June 26th, 2008.

I took 3 home pregnancy tests prior to a Dr's appointment.. The first one was 6 weeks after my lmp (August 7th- it came back negative) the second was taken on August 12th (negative) and the third was taken August 24th (it came back positive).

Conception / Dating

Cynthia Flynn's picture
Experts: 

QUESTION

Dear Midwife,
I need some help and answers to when I conceived. I had sex with my ex partner after a row with my partner. I have listed all my dates below.

I have irregular periods and hadn't had a period for months, so I went on the pill to help bring them on. I didn't continue with the pill after my period.

1st Trimester Ultrasound Dating

Jane Foley's picture

QUESTION

Dear Ms. Ultrasound,
Hello! Was hoping for your expert opinion regarding ultrasounds. Is it at all possible that a 9-week gestational age per ultrasound could be off by two weeks? (And I am not confused as to the "missing 2 weeks" in calculating gestational age.)

Basically, in mm or cm, how much bigger is an 11-week pregnancy compared to a 9-week pregnancy?

Thank you!

Ultrasound Dating

Jane Foley's picture

QUESTION

Dear Ms. Ultrasound,
Hi I need some help on answering a few questions from a professional.

I was on the pill and during my seven day break had sex with an ex partner I got a period 3 days later. Sex took place on the 09th August and had a period on the 12th August.

After my period I didn't continue with the pill as I have irregular periods I only took for a month to get them started as they hadn't come for a few months.

I had my very first ultrasound on the 7th Oct and the lady said I was 6 weeks 2 days, and would have conceived about 4 weeks ago.

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