Losing weight in the second trimester.

Ryan • I`m 25. Single mom of two toddlers born 13 months apart and they are my absolute world! Jaxon Abel and Calliope Elizabeth. And of course, my angel baby Violet💕 also obsessed with make up! So if you ever need tips and tricks and advice hmu!!!
So I've been taking baby bump pictures every week since 9 weeks. And I took the other day one for my 13 weeks and realized I looked like I lost weight in it since the 12th week photo. So I checked my weight and and I did end up losing five pounds. I've been eating normal but did throw up a couple times last week. Is it normal? I'm sure it is but you know how pregnancy paranoia is lol.