1:180

I just received a call that my baby due in August has a 1:180 chance of Down syndrome strictly because of my age. My 20 week ultrasound didn’t show anything abnormal. I now have to go to a more in-depth ultrasound 5 hours away on Wednesday. I will love this baby either way and it may be wrong to say but I will be devastated as it’s my one and only baby. Have any of you experienced this? Tomorrow we are planning my shower with a cousin and a friend I don’t see very often and it’s supposed to be a happy day but I’m worried sick and we’ve already decided not to tell anyone until we have more answers.