Possible tw ....

Hiya ladies just wondered if anyone else had been through this I went to my 20 weeks Anatomy scan little mans body and head are measuring perfect but his thigh bone was measuring two weeks behind so they wanted me to go back 4 days later where they picked up two echogenic foci in his chest so had to go back to days later to see a consultant who then did a a more detailed scan she said with her findings there is a possibility he could be Down syndrome my blood work for Down syndrome came back 1/746 they said they could do an Amniocentesis but I refused as he will be loved whatever happens, but just wondered if this had happened to anyone else and the out come was?

Many thanks x