Calculation....

[MissDana1186]

Why do the end of your last menstral begin the calculation of your pregnancy instead of the day you actually got pregnant? Wouldnt it make more sence 2start ur pregnancy calculation on the day u actually concieved? I dnt understand. My 1st week of pregnancy start Jan 25 but i didnt get pregnant til Feb 7th....

[Combs7]

Also it's the first day of your last period they calculate by not the last.

[bakinglovemuffinnumber3]

Most people don't know when they actually concieve. I did with my 2nd because my husband and I only have sex on "certain days" because of our schedules and it was the night of a wedding (open bar lol)! So I knew we concieved on June 20th or within 2 days after since sperm can take awhile to get to their destination. I told my Dr. this and based on that we came up with a due date of March 15th, but babies aren't usually born exactly on their due date anyway and mine ended up being a week "early". If you know for sure that you concieved on the 7th or a cpl days thereafter, I would go with the slightly later date, but again, dates that close don't matter too much and Mamabays is right, your ultrasounds will have give you a good idea of exactly how many weeks you are.

[Mamabays]

They will take measurement of the baby and give you a date if it looks like it should change. My due date is 10 days different than what it would be going of my period.

[MissDana1186]

So when i have my ultrasound will my number of weeks change cuz right nw it looks like i got pregnant b4 i had sex &thats not good.

[Mamabays]

Because unless a Dr implants the eggs in you there is really no way of knowing your true date of concieving.