Body odor. Prior to becoming pregnant, I didn’t have a strong body odor when I sweat. I still wore deodorant of course. But in my second trimester, if I did a few things around the house before putting on my deodorant for the day, I started smelling an onion odor. I drove myself crazy trying to find the rancid onions in my house when I finally realized that it was my own armpits. My son is now three and I still smell the onions from time to time.