Hey, I've got a running question.

I'm usually of medium fitness, when I run at night I'm used to running 5 k on my treadmill or outside when it's not awful. I've been finding it harder and harder to push out even 2 miles - I felt super accomplished for getting out 2.15 miles tonight. Does anybody here have any tips on running while pregnant? With my first pregnancy I ran 3-4 5ks a week up until my 7th month but I've got no energy this time. How can I get my energy levels up so I can keep on being active?