Am I under fueling?

Hello! Just thought I’d ask to seek out a little advice for those in it for a while…

5’3 47F 155lbs looking to get to 125, or just feel better in my clothes.

I’m on week two of 1400 calories a day. Started feeling sluggish near the end of this week and now I’ve caught a cold. Strength training three times a week, walk about 10k steps daily.

So is this a possible sign I’m under fueling?

Any insight appreciated!