My Third Trimester: [symptoms, supplements + must-haves] The farther along I got in my pregnancy, the faster it felt like it flew by... At least until we were at 38 weeks and we knew he could come at any time. And at 39 weeks, I took maternity leave which also made the days seem longer. At this point, you know the drill.. continue reading for all of my third trimester details! 28 weeks! Baby is the size of an acorn …