Would you be a little upset?

So we told my MIL we're expecting. Her reply? "Well I think she needs to get her tubes tied" No I'm happy for you, no congratulations, nothing but that. Now this is our 3rd pregnancy and will be our 4th child since we adopted one if that makes a difference. To me I don't care if we had 1 kid or 10 kids it's not a very nice response. I didn't really say anything as I was taken back by her response. Am I over reacting or would you be upset too? What would you say to her about her response?