Hi Rosa

My last pregnancy was a Trisomy 20, 3rd chromosome of the 20th, also not compatible with life. Both hubby and I had genetic testing and we are fine. I am now pregnant! It is a random thing and you really have to believe in the miracle of mother nature getting this right. When those cells split a million times we have to hope that mother nature gets it right and sometimes it goes pear shaped. Talk to your GP about getting blood tests done on both of you to make sure that all your chromosomes are in order and then you can both make a decision from there.
Take care and believe me you are not alone in this. So many of us have been where you are at and come out the other side.