hi hun
the mw will take about 4 to 5 lots of blood from u (from the same needle they just change the tube lol thank god )
they will next 4 downs ,stds, animia, spina bifida and sickle cell if u havent already had it done
the downs test will only tell if ur high or low risk, if ur high risk u can hav a amnio thats the needle in the tummy and that will tell u yes or no
but i wouldent worry 2 much about it ur more likely 2 get a letter through the post saying low risk
hope this helps xxxx