Normal ? I’m scared

Ever since I had my baby I noticed when I feel my tummy area it feels like I have a bunch of lumps / small balls and sometimes they move around if I push hard enough .. is this normal ? I have gained over 15lbs since I had her as well and I am well over weight since before I had her… any medical problem I have ever had my dr says it’s related to my weight. I weigh 235 I’m 5’7 and a lot of this weight is in my lower area. I also have bad stomach pains so I over think and start to think their tumors.. does anyone else have this ? (Also not pregnant I just noticed this is usually the only place people respond )