Can my due date be wrong?

i have been doing a lot of thinking lately and i am thinking my due date is wrong... this is my first pregnancy... i am 25 weeks preggo today.(the doc says) i hold had ultra sounds starting at (5weeks) there was already a heart conquer and the doc based my due date on my last period... be feb1st... (i think) now that i think back it be light and short) ever since my 12 week ultra sound the baby measured at rather over 13 weeks... and 16 weeks she measured at 17 weeks and i found out she was a girl... it was very terribly clear that early... at this time i was already feeling seriously of movment and everyone said that was early since i am a first time mom... and now at my closing apt (22 weeks) she measured at 25 weeks and weighed of a 27 week preg... she also started getting hickups earlyier then when they even start swallowing.by feb 15th i knew i be preg very preg i was very sick boobs hurt really impossible and i could just tell but my preg test didnt read positive till (the subsequent time i took the test) feb 21st... so i think that "period" was implantation... and i am two weeks farther... i know two weeks doesnt make a difference that much, but to me it does, i requirement to know who the babys daddy is... please no judging, i just need your opionion on my due date
they can be wrong!! and you cant really go by ultrasounds!! my last 2 have said I'm stale by 3 days!! i go for another on Monday so ill see what it says!!i purely go by my lmp
Your doctor calculates your due date bad your last period two weeks after it when a normal ovulation length is. So your dude date is correct on those terms. That means depending on how many days your cycle usually is one of these is your conception date.

25 day cycle: February 12, 2009
26 day cycle: February 13, 2009
27 day cycle: February 14, 2009
28 light of day cycle: February 15, 2009

& So on.
Answers:    The earliest ultrasound you achieve is more accurate than anything that happens later on. The reason for this is that at remarkably early test, some things occur that simply CAN'T come to pass before x number of weeks. Here is some more info (and check out the link)

"Early in pregnancy (1st trimester), fetuses of the same gestational age adjectives are nearly identical in size. At this time in pregnancy, nearby is very little difference in size between those fetuses who ultimately will be large, average size, or small. As pregnancy continues, these genetic and constitutional differences surrounded by size become more important clinically. It is not possible, for example to separate a 20 week fetus who is large from a 21 week fetus of mundane size, or a 22 week fetus who is small for its age. All three will measure as though they were 21 weeks."

Therefore, your first ultrasound is your most accurate. Ask your doctor what your day of conception would be base on this scan. And of course, if you are still unsure about the father you can always lug a DNA test after the baby is born. Source(s): http://www.brooksidepress.org/Products/O…
my lmp was jan 26th and Ill be 26 weeks monday. My girl's heartbeat was clear at 5 weeks. I tested positive at 2 weeks after intercourse on Feb 22nd and developed tender breasts rash on. if you got a positive feb 21st then I'd wonder if youre closer to where I am since I get a preg. test early (4 days before my period). I concieved Feb 8th so Im confused if you know you felt you were pregnant Feb 15th- wouldnt you have conceived around afterwards if youre about a week behind me? so you couldnt have feel very pregnant unless you are indeed further along. I felt movement at 15 weeks and 4 days which is pretty early.

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