All of my scans have dated me correctly and my EDD has stayed the same throughout. I will be 20 weeks tomorrow and most like conceived sometime between the of March, but I was on dating and monitoring my cycles and ovulation. Sounds like with your antibiotics they interfered with your BC and that you ovulated later than you normally would had you not been BC. And I would guess that the dating scan is probably dating accurate health on baby measurements. Sounds like you ovulated late due to the BC and antibiotics.
How accurate is dating based on 8 week ultrasound?
How Accurate Is Ultrasound Dating At 6 Weeks - How legit are dating scans at 6/8 weeks?
A dating scan is an ultrasound examination which is performed in order to establish the gestational age of the pregnancy. 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. Dating scans are usually recommended if there is doubt about the validity of the last menstrual period. By 6 to 7 weeks gestation the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage 90 to beats per minute under 6 to 7 weeks, then to beats per minute as the baby matures.
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