Before the scan you will be asked to drink a lot of water and have a full bladder, as this puts the uterus in a better position to be scanned.
This can be something of an uncomfortable challenge if your sonographer has particularly long waiting times.
Having a scan in the first few months of pregnancy can be a thrilling experience.
It's amazing to see the little blob with a heartbeat that will soon become your baby.
This is the period of time which provides the most accurate assessment.
Generally, ultrasounds which are performed in the first trimester are within 3-5 days of being accurate in terms of assessing gestational age.
This is even though you don't actually conceive until 14 days after your LMP, or later than this if your cycle is longer than 28 days.I had to drink so much bloody water before my scan only to find there was a delay before my appointment – I felt like I was going to explode.I'll never forget one nurse asking me, 'Do you think you could just pop to the loo and let just a little bit out? ’ When it comes to the actual scan you'll lie on your back and then some sticky, clear gel will be rubbed over your abdomen.Not all units offer an early scan if all is going well in this pregnancy, though.Ask your GP if you want the reassurance of an early scan. The scan's main purpose is to work out accurately how many weeks pregnant you are and estimate your due date.