Similarities???

Sorry if this been posted or discussed before.. It,s been suppossed to that in the Med Pod scene, Shaw discovers that she,s infected',impregnated?with "something" and decides to remove it from her inside.This scene is very similar to that scene in ALIEN 3, when Ripley feels wrong and goes to a similar medical device and with the help of Aaron discovers that she,s infected with the queen embryo..furthermore..At the beginning of ALIEN RESURRECTION, we find another "medical device" that removes the queen embryo from Ripley 8... Your thoughts?