Tired ALLL THE TIMMEE

Megan
Today's to do list: 20 different things.
Morning mindset: start the day with a workout to get motivated to get sh** done. 
Current level of motivation: 0 
I remember hearing that energy levels go up after the first tri, and they did, slightly, but lately if I'm active in the morning I can't seem to make it past noon without feeling completely drained and needing a nap.
And if I do a big activity like ski or hike or run, forget about it. I'm down and out for 2 whole days.
Does this happen to anyone else? Will this continue to happen through the whole second half of my pregnancy?