So, here's my stupid question

 Does a blue line mean that Kristen is pregnant and she's lying to Jen?  I'm not even sure they had these kinds of tests when my kids were born in the late 70's, early 80's so I haven't a clue how they work.  And I know I'm beating a dead horse by saying it, but don't these women ever go through menopause?  Next thing you know, Caroline will be pregnant by someone when she was in California but won't be able to remember who.