Confused roughly speaking conception and due date? Please give support to!?

My periods are irregular. I have been tracking my ovulation since November trying to grasp pregnant and it is always between 24-26 days. My LMP was May 6. I ovulated on May 20. I took a test on June 24 that be negative and still no period so I retested on July 4 with a positive result. Every online calendar and calculator say Im about 13 weeks pregnant and due on February 10. I just got support from the doc (where I had an u/s) and was told that I am not due until March 4 and I didnt conceive until June 5. Now I know that u/s are very accurate contained by predicting a due date by measuring the size of the baby but the dates done manufacture sense to me. I KNOW I ovulated on May 20 because I have been testing day after day for several months. And If I am only 11 weeks instead of 13, how come my due date is more than 2 weeks later than the online predictors say?

Any insight would be encouraging! Thank you!
ashj_121 is right. You didn't ovulate on the 20th. Ultrasounds in the first trimester have an meticulousness of +/-3 days of true gestational age. You Od later Source(s): Due in Oct
You're just going to have to face the reality that you will NEVER know exactly when you conceived, what does it matter anyway? The baby will be here when it's ready to and there's nil you can do about it!
Well my LMP was May 4th, and I ovulated on May 16th. My midwife has estimated my due date as February 11th. So I would right to be heard go with your first instinct.
Pregnancy is dated from your LMP. the first 2 weeks of pregnancy are freebies.

The age of the fetus is always 2 weeks smaller quantity than how many weeks pregnant you are.
Answers:    You may have ovulated or tried to ovulate on the 20th. You can never be sure the egg dropped, so to speak. You missed that period and tested getting a Neg result. So, you may have NOT O'd on the 20th as the audition predicted(not fool proof, mind you), but later.

With my now 3 year old, I swore! that I have O'd on one date, to have O'd again a few weeks later and getting pregnant. I was charting and everything, but my body go wacky that cycle.

Congrats on your pregnancy
The online predictors can only make clear to you a best guess. Women do not ovulate as predictably as they count on. You could have easily ovulated 15 days after the last ovulation. I usually do. It could own been a fluke of your cycle too, since you say you are irregular. And it makes more sense that the denial test was only 19 days after conception fairly than several weeks. Usually the test would show pregnancy by then. So, you are 11 weeks pregnant, since the due date is March 4th. The sonograms in the first trimester are severely accurate at predicting fetal age. So, it just looks like your ovulation had a bit blip. And you got pregnant! Nothing better than that.

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