Second pregnancy and my stomach is so round and out there, lol..but it doesn't seem like baby belly??

I'm 15 weeks and have finally noticed that my belly is sticking out, but it's my WHOLE stomach area from under the too the top of my pubic area...it still seems really squishy though...once in awhile it feels a bit hard very low in the abdomen but you gotta push on the area...what the heck, lol. I know the baby is only about 4 inches so there is no way this is ALL baby. Is it normal? Maybe my insides are moving up and out to make room for baby?? I have been nervous for a few weeks now that I should be obviously "showing" but it just feels like I'm fat...My first baby you could tell I had a little pouch by 3 months, then at 4 1/2 months my whole tummy was rounded out like now, but felt firmer...aye aye aye, anyone feel this way??