Most dating scans are done with a trans-abdominal transducer and a fullish bladder.If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures.If so, you'll have these scans in early pregnancy at clinics in larger hospitals.Even if you've had a miscarriage before, as long as your current pregnancy is going well, you may not be offered a scan. So if you need the reassurance, your GP should be able to request an early scan for you.
That may give some information about your pregnancy, but it is less clear than an internal scan and that could possibly delay diagnosis.
Ultrasound scans in pregnancy may be routine or they may be offered because of pain or bleeding or because of problems in a previous pregnancy. In early pregnancy, especially before 11 weeks, it is usual to have a trans-vaginal (internal) scan, where a probe is placed in the vagina.
This gives the clearest and most accurate picture in early pregnancy.
Although waiting can be hard, a later scan will give you more information.
In the early weeks, a scan is usually carried out via your vagina, as your womb will still be deep in your pelvis.