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Because after your period ends, it takes a couple of weeks for you to ovulate again.

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Q: My last period was 11-14-2007 but i went to the doctor on 12-28-2007 and they told me i was 4 weeks but if i do the math from now back to nov 14 i should be 8 weeks so why is the ultrasound sayin 4?
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Related questions

How do you guess the week of pregnancy if the period is irregular?

Don't guess, go see the doctor and have a ultrasound.


How can you tell how far pregnant you are if you do not know the exact day of your last normal period?

That would be a good question for your doctor. The doctor might suggest an ultrasound. From the ultrasound picture, the technician can estimate how old the fetus is and predict your due date.


What if you have sypmtoms of pregnancy but get a false pregnancy test?

Wait a week and see if you get your period. If not, test again. If that one is negative and you still don't have your period, see a doctor for blood testing and an ultrasound. The only true way to see is an ultrasound!


Is there any chance to view anything in the uterus through ultrasound scanning done 36 days after last period?

Ask your doctor


I had a positive pregnancy test two days later i started bleeding i had clots but it wasn't my usual period?

Go for an ultrasound and talk to your doctor.


12 weeks since miscarriage and no period yet What do you do?

Book an appointment to see you doctor!! You should probably have an ultrasound scan to see what's happening.


What does it mean if my lower stomach is sore?

You could be lactose intolerant.. or it could just be period pain.. or gas?? if in doubt the doctor is the best bet - just in case u need an ultrasound you don't need an ultrasound...it's like your sick or anything.


Is it normal after an ultrasound to bleed a little bit of bright red blood?

Spotting is okay, but period bleeding is bad and if that is your case, you should see a doctor right away.


When your pregnant how can you tell how far along you are?

When you go to the doctor, he will be able to help you figure out when your last period is. They are also able to determine when your due date is by the ultrasound and by feeling around.


If someone has a false period during pregnancy will examination and ultrasound eventually establish accurate fetal age?

Well we just went to see the doctor about my fiance who according to her last period should be roughly 16 weeks along. The doctor said she was showing signs of being more like 20 weeks. My fiance's last period was late and light, and on further thought could quite possibly have been a false one. The doctor said when we go back for the ultrasound next month that we would be able to tell more accurately what the actual age was.


When doctors do an ultrasound and say you are 14.2 weeks is that usually a measurement from your last menstrual period or the time you conceived?

Why not ask the doctor? Usually they time these things from the last period. But seriously, if you have a question about stomething your doctor tells you, you should speak up instead of asking anonymous people online. Great answer, applies to a lot on here. If 14.2 weeks by ultrasound, then 12.2 weeks from conception. But at this time can be a 4-5 days out either way.


I took a five days course of Primolut-nor when do i have my period after that?

you have to wait upto 14 days after the completion of you primolut course then you have to consult your doctor for ultrasound or any other check up thankyou.