Should I get a vaginal ultrasound at 7 weeks or wait until 12 weeks?

Jade
vaginal ultrasound at 7 weeks or wait until 12 weeks?" />
Hi, I'm looking for some advice. I am 6 weeks pregnant today and have been offered an early scan at 7 weeks due to a chemical pregnancy in July. 
One of my friends miscarried 3 times and each of these times she had a vaginal scan around the 7 week mark. With her 4th pregnancy she waited until 12 weeks and got an abdominal scan and went on to have a healthy pregnancy and baby. Despite all articles and midwife telling her the early vaginal scans in first 3 pregnancies did not contribute to miscarriage she believes it did.
What are your thoughts? Does a vaginal scan effect the baby? Should I go at 7 weeks or wait until 12? Any advice or sharing your own experiences would be much appreciated.

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