2 ponds Weight loss in week 35😰

Hey, I went for ultrasound this week starting and I was 152 pounds and my baby is abit small. I have started eating more now - healthy and more calory food.  And then I lost 2 pounds this week.. Omg 😳
I am so surprised - with the increase in diet weight should increase right ? Don't know what's happening😣 any idea??