Surprise burst of energy

I went to the gym today a little pooped, but ended up getting some sort of second wind and thus enjoyed some extra time on the treadmill...

Today's pre-ultrasound workout:

Warm-up: row 1000 m (5 min)

Alternating sets:
Squats - 65 x 10, 10, 10 + finishers 45 x 18
Calf presses - 240ish x 10, 10, 10
(Compare to last time, when I had much less energy)

Alternating sets:
Bent-over rows - 25 x 10, 10, 10 (each arm)
Back extensions - 12, 12 (stopped after two as back began to cramp)

Treadmill:
1/4 mile intervals - 5.5 mph/7.5 mph x 3
Another mile @ 6 mph + some walking during heartrate checks (which ultimately failed).
Total: 2.6 miles in 25 minutes.

I was just going to do the intervals, but the 6 mph pace felt so good, I just couldn't stop. I would've kept going antoher 5 min but I really had to go to the bathroom...

Weigh-in: Still 138...

Then, off to the ultrasound, which was an amazing experience. It pretty much confirmed that those mysterious abdominal gurglings MUST be fetal movement. The kid's a g-d gymnast! Plus there are those great big farmer hands that are already practicing the flick...