Pregnant = losing identity?

Ann Marie • 35, Boston area. I have a 2-year-old son, pregnant with my second, due July 2018
I'm in my 30s and have worked really hard to get to my current job/career. Everyone who knows me, knows that I'm career focused. I'm pregnant and will take a normal length maternity leave and return to work. 
However, once people find out I'm pregnant, that's all they talk to me about, and assume that's all I care about. I mentioned a work project to friends, and someone actually said "you're about to be a mother, I'm sure you have other things to worry about". WTH? Have any of you experienced this pregnancy/baby cloud surrounding you?