It's wonderful to see a little blob with a heartbeat that will become your baby. If you are unsure of the first day of your last period you will be offered a dating ultrasound when you are between 10 and 14 weeks pregnant.
But ultrasounds can also lift the lid on a few worries you might be having. The main reason for the ultrasound is to work out how many weeks pregnant you are, and to estimate your due date.
This would make my conception date April 7th, which is the exact night I was with the first man.
Every pregnant woman wants to know her due date, and a due date that is calculated from her last menstrual period often doesn't match the due date that is estimated by her first ultrasound (also known as a sonogram).
dating from the first day of your last menstrual period or date of known conception is what most Physicians will go on. and hey, chances of your little bundle of joy arriving on your actual due date is only 5% anyway.However, conception doesn't actually occur until around 14 days after your LMP, or later if your cycle is longer than 28 days. Multiple pregnancy: antenatal care for twin and triplet pregnancies CG129. You may know when your LMP was, but not when you actually conceived. Due to having wavering periods, I never really keep track, and therefore I don't know when my last period was.I can give an "estimate" but I really don't know because I never keep track.