First UltraSound Or Second One?

I Had an u/s done on oct.22,2010 sayin i was 7 weeks due date june 10th. This Wouldve meant that i conceieved when i was with my bf sep.17 2010. But i just went to get another ultrasound done and stated that i was 20 weeks and 1 day on jan.17,2010, giving me a due date of june 5th, if you calculate my LMP(aug.29th) this would be accurate for a 28 day cycle but i have a 31 day cycle. I was with someone else on sep.10th once unprotected, but my bf has been getting all the symptoms, nausea, nosebleeds... should i worry or should i just go by the first u/s? PLEASE HELP

[Clysta]

Paternity testing is the only way you're going to know. Ultrasounds can be off (especially as pregnancy progresses) and there is only a week difference. It doesn't matter what your partner feels as well. They're either sympathy symptoms or illness and don't mean or signify anything.

[melissaphelps25]

First off. You will need to get a DNA test... If you google when you concived based on your LMP and a 31 day cycle your Due date would be June 8th. And likely got pregnant on or around Sept 10-18th.. So yes you need to be worried. I think you should do a DNA test. You had BD with 2 guys 7 days apart. So the odds are it could be anyone of them....Have you told your BF yet that he may not be the father? You should really tell him that. And you should tell both guys to do a DNA. Thanks

[7690]

No i havent told him because my doctor told me that i conceieved on sep.17th. So Ive been going with that.

[littlelady2010]

Usually first ultrasounds are more accurate, but never exact, every pregnancy is different, all babies grow at different rates. Unfortunately there is no way to tell who is the father of your baby. The decision is yours, but I think you know you will have to tell your bf and do the dna test, not only for your baby, but for your boyfriend... And yourself, you deserve to know who your child's father is. You made a mistake, but that doesn't make you a bad person, but not telling the truth would. I wish you and your baby to be a healthy and safe pregnancy and delivery!

[Clysta]

Unless you had medical intervention, it's impossible to know when conception happens. What your doctor is telling you is only a guess based on either ultrasound or LMP and is only that. A guess. You have to be upfront and honest about what you've done, not only for your baby but for the father as well. They have a right to know if that child is their's.

[LosingMyMindInGA]

First trimester ultrasounds are THE most accurate.  Once you reach the second trimester all fetus' begin to grow at different rates.  A 2nd or 3rd trimester ultrasound can be off by as much as 2 weeks either way.  Always go with the original due date of a first trimester dating scan unless you doctor specifically changes your due date.

Unfortunately with the dates being so close the only way to establish paternity for certain will be a blood test after the baby is born.  As Clysta said it would be best to go ahead and be upfront and honest now.