So my coworker who is also a close friend hasnt been feeling well lately. We joke that she is pregnant because she was very sick when she was pregnant with her DS 4 1/2 years ago. She decided to go to the dr today and she was dehydrated so they sent her to the ER. She sent me a text saying "I'm pregnant..." (I got a phone call from the emergency room 4 1/2 years ago when she found out she was pregnant w/ DS) so I said back "are you serious?" (half hoping she was because she has been wanting to get pregnant, but her boyfriend said no to actively trying, but yes to NTNP) then she said "hahahahaha nope just kidding, the dr hasnt even seen me yet" and then again another text saying "hahahahahaha"
My problem is that she has known that we've been TTC and are going through infertility treatments. She knows I've been heartbroken in the past because of all the

s why would she think its ok to joke about her pretending to be pregnant.. but then say haha just kidding!?
Am I over reacting or would you be upset too?
Again if she got pregnant I would genuinly be happy for her, but why throw this "just kidding" crap in my face!