Yup, unfortunately. Totally the norm. We got it from four on up. Although I have been pleasantly surprised this time. It has been better this time. Not great, but better. Maybe because they are quite certain we are crazy.
As for the stupid breeder bit. Google "demographic winter" & "population myth". That junk is based on the incorrect theory of Thomas Malthus (You can also look up "Malthusian economics". That was popularized by a book in the mid 60's that Al Gore is/was a huge fan of.
Unfortunately Mr Gore and others who have read the book did not do their homework to learn that it is based on faulty and non-factual premises.
And as for me I am thrilled to hear you are pregnant! Remember it is a surprise, because a surprise is something wonderful that you didn't know you wanted. An accident is something bad that you wouldn't want to happen. Language is powerful!!!
And when I am asked "Do you know what causes it?" My answer is "Whipped cream and sleeping kids!" DH who works in a prison, usually answers "Whipped cream and handcuffs!"
Usually stops the rude comments in their tracks. Either it makes them laugh or it makes them embarrased. But either way, they realize that they probably shouldn't be asking about my sex life!