Do you start calculating pregnancy the day of intercourse?

Lexie<3: Do you start calculating pregnancy the day of intercourse?
I know they say to calculate based on your last menstrual cycle but mine has always been extremely irregular and I have no idea when that was. The only thing I am sure about is the exact date of intercourse. So I would like to know straight up whether I can start counting 9 months from that date? If I do that then I am 6 weeks pregnant but I would like to know if that is accurate?

Answers and Views:

Answer by JellyBean
I don’t think there is any accurate way of knowing for sure how far along you are, since your periods are irregular. Your ob’s office will do an ultrasound at your first appointment with them to date the pregnancy. This will be the only way to get an accurate result.

Answer by Bacon
Full term pregnancy is 40 weeks… 9 months leave you with about 36 weeks. Semen can survive about 72 hours, so I suppose you will have a pretty close estimate.

Answer by Due Jan.1st, 2011
No. You’ll have to date it by an early ultrasound.

Answer by due june 28
well pregnancy is 40 weeks and usually you can find a pregnancy calculator that uses intercourse as a due date finder… to be 6 weeks you would have conceived the baby on May 29th and due date would be feb 19 2011. If you give your date people could help you better?!

Answer by Brianna S
No. You count from the first day of your last period. My periods when irregular too. 22 to 40 days in between. My ultrasound is accurate with the first day of my last period.

Answer by Alwaysright
enter your information and it will give you an idea.the doctor will also be able to tell you better than anyone here.

Answer by c c
Due dates are not set in stone and can be calculated in many ways and each could be vastly different.

You start counting from the first day of your last period. This due date is called “LMP due date.”

You will probably get a different due date once you get an ultrasound, and that one may change if you have other ultrasounds.

You will probably get yet another due date once you really start to show. Your doctor will measure your belly from the top of your uterus to your pubic bone.

Using all of these will give the doctor a guesstimate of when the baby will actually get here.

I guess since you don’t know your LMP, start with the date of intercourse, then go back two more weeks. That will give you a close enough estimate since *most* women are at peak fertility two weeks after the first date of LMP.

Answer by Doodlestuff
That’s how I calculated my due date as I had irregular cycles at the time, but I had only had sex the one time. Baby was born right on time. The doc used measurements at 6 months to make a due date estimate and our estimates only varied by 3 days. Keep in mind that there will be some variance because you don’t actually get pregnant the day you have sex. It is way more accurate if you have irregular cycles!

If you look for due date calculators, there are ones that are based on conception date. Try some of those to work it out. It is not true that you must have an ultrasound to figure out a due date. When you only had sex once during a whole cycle, it doesn’t take expensive technology to figure it out.

Answer by Andi
That is not the best way to calculate at all. Since you have irregular periods you will have to discuss that with your OB, they will do an U/S and that will be more accurate. Otherwise you’re just guessing.

Answer by Emma
im the same way, i knew the day it happened, my last period and the date of conception didnt correspond AT ALL,

the way they calculate it is by adding 2 weeks to your pregnancy, i went in thinking i was about 7 weeks and they did the wheel test to determine your due date and how far along you are, and she told me i was about 9 weeks, and i went in for an ultra sound right after that and the tech. said the same thing.