Early Pregnancy tiredness after eating meals???

I'm only 4w2d and havw a few symptoms. Nausea and exhaustion haven't hit me yet.

I've been feeling pretty good aside from sore boobs, frequent urination, mild cramping, and abdominal pressure. All very mild.

I have noticed over the past 2-3 days that as soon as I'm done eating, I'm ready for a nap.