Hi there, is anyone great at explaining the first tri screening that's optional? I am 10 weeks today and don't have my next appt til 12 weeks, so I plan to ask my dr questions then but if someone could help explain that would be great! It looks to me like it's a 2 step scan...?? I'm going to call today to find out the cost(s). I am thinking we may do this screening. Then is the second tri screen not necessary if first is done?! I'm so confused!