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Understanding Unexpected Pregnancy Test Results: Ultrasound Discrepancy


Question
But see, that's the problem: I did not have sex at all in December. There wasn't even a male around that I even talked to. There is no way possible that I could have gotten pregnant in December. That's what I don't understand. And the party was not until JANUARY 21st. When I had the sonogram, it showed that I was 11 wks, 5 days. But like I said, it is not possible that I became pregnant in December, so how can it say that I got pregnant then?
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Followup To
Question -
I am 23 years old and have one son that is almost 7 years old. I have had 9 miscarriages since my son was born, 4 of which were determined to have ended because of low hormone levels. After my last miscarriage on February 1, 2005, my doctor sent me to a specialist to determine my reason for miscarrying. She found 2 large fibroids in my uterus and removed them in July 2005.
My husband is in the army and stationed in Iraq right now. He was able to come home from November 11th to November 27th and we were trying to get me pregnant. My periods had been kindof speratic since the surgery to remove my fibroids. They had been coming every 4-8 weeks and lasting anywhere between 5-7 days. My last period before my husband came home was November 6th. I did not get a period in December, but that did not surprise me because of the inconsistancy and also the stress from Christmas. I had what I thought was a period on January 10th for 3 days and it was very light.
On January 21st, I went out to a bar with some friends and afterwards went to a large party with them. I wasn't feeling very good, so I found a bedroom and layed down to sleep for a little bit. When I woke up, I was naked from the waste down and my pants were on the floor. I was scared to death that someone had raped me while I was passed out.
I told my husband first because I was afraid to tell anyone else in case something really didn't happen. My husband convince me to go to my doctor to have tests run. I had waited too long to have any drug tests or anything, but she did do a pap and a blood test to find out if I was pregnant. There were at least 3 other female patients of my doctor that had the same thing happen to them on the same night. One of them had come in early enough to be drug screened and they had found the date rape drug in her system. My doctor thought the same thing had happened to me.
We found out from a blood test that I was pregnant, but my hormone levels were too high to have gotten pregnant on that horrible night. My husband was sent home on February 15th to be with me for moral support and to figure out exactly when I got pregnant. We had a sonogram done on February 27th. We saw the baby and heard the heart beat, which was 167 beats per minute. We could see the baby's head, arms and legs.
My doctor said that according to the sonogram, my baby was conceived on December 20th and that date matches better with my hormone levels. I told her that there was no way possible for that to happen. She said that the baby is my husbands and that my hormones could be a little low again, just not low enough to cause me to lose the baby, and that my hormone level could be the reason the baby is measuring small. She is using the due date calculated by the sonogram, which she said is September 12th. The hormone level thing made sense to me, but now my husbands doctor said that that is in no way possible.  I know for a fact that there is no way that I got pregnant between November 27th and January 21st.
My husband and I are both completely confused about all this and I'm almost afraid to talk to my doctor about it because I don't want her to think that I'm second guessing her because of what another doctor told my husband. Could the sonogram have been that wrong? If it is right, is there any other explanation for why the baby is measuring small? If you can help us to understand this, we would be most greatful!
Answer -
When you took the sonogram, how many weeks pregnant did it say that you were. A sonogram is not accurate for dating  too early. If the due date calculated to September 12, then your last period would be December 5 and you would have ovulated on December 18. YOu could have conceived if you had sex on December 17,18,19, or 20,or 21..You would now be 15 weeks 5 days. At 15 weeks, a sonogram is very accurate.It appears that you conceived at the party. I think your doctor just wanted to spare you any grief. If the information you gave me was correct, You became pregnant n December 21 and you are due on September 12.

Answer
Your last period was January 10. Therefore, ovulation was probably January 22, and you could have conceived if yuo had sex  on January 21,22,23, or 24. If you did conceived at tht time, a sonogram would show you to be 6-7 weeks pregnant on Febuary 27. This is perfectly accurate. You are due on October 17 and you should now be 10 weeks 2 days pregnant. Your original doctor made a mistake in interpretation of the sonogram. You m ust have become pregnant at the party on January 21 and your husband is, infortunatly, not the father of the baby. I would repeat the sonogram on May 26 (20 weeks gestation). At tht time the uterus should be up to your belly button. Good Luck.