How do you calculate your conception date??? Does anyone know??? The first day of my last menstrual period was 11/17 but…

You subtract how many weeks and days you are from today and you'll have the day you conceived

Doctors usually go by the first day of your last period to determine your due date.

Isn't there like a window of conception? I've been trying to look it up and I keep reading about you have like a 7-10 days window of fertility from the first day of your last menstrual period which would mean my due date is off @babywalkermommy

http://www.baby2see.com/conception_calculator.html that website will give you an estimate.

@cubanese, that's what I thought but my doctor is going off my most recent ultrasound. Which makes me wonder if maybe my due date is off???

You probably conceived before your period. My due date was off until I realized I conceived before my last cycle

@mommytoprincessmckenzie, I've been on that and it gives me 2 different dates, one based off my LMP and one based off my anticipated due date

Yeah, I noticed when I tried it. @harleyquinn420 but when I was 7 weeks, baby was a week behind.

@babywalkermommy, I mean, there was an accident with the condom breaking (sorry if tmi) before my period and I took plan b the next day and then I got my period like 3 days later so I figured that meant I wasn't. Idk I was just curious to see if I could possibly calculate it

@cubanese, thank you!!! That helps

@harleyquinn420, lol it wasn't tmi but you could've taken an defective one that didn't work. I calculated mine that way

They usually do go by the last day of your date. It happened with my first born that they went by the last day of by period and she was born on my due date. But every pregnancy is different though... 🤔

I used Instagram, no joke

I'm due September 16th and my last period was 12/11. how are we so far apart lol.. I know my date of conception bc we weren't having sex much around that time. which was 12/27.. and by my 20 week ultrasound they said the estimated due date was still the same...

@lucyyxoxo_, idk lol

According to my very first ultrasound, I got pregnant exactly a week after the start my LMP. I got pregnant two days after stopping my birth control to try and conceive so it makes sense that my due date is a week later than my LMP.

@haleymclain1121, I took plan b before my LMP and I think I conceived the first weekend in December but idk. That's what one of my friends calculated and I can't figure out how she did it. I get November 30 +/- 2-3 days

You're 10 days ahead of me so that means you conceived December 4th. But that's just by your due date.

@harleyquinn420,

But if your due date is September 13th then that means you conceived on December 8th which makes you 6 days ahead of me because my due date is the 19th.

Ok, that helps a lot actually @haleymclain1121