Having pregnancy symptoms but…

Cali

Getting a negative pregnancy test. I’m a mother of 4. My children are ages 4,3, and twins that are 2. I’ve been having nausea, stomach cramps, back pain, and increased appetite. If I were to be pregnant I’d be 4 months. Yesterday I felt movement in my abdomen. And my stomach is growing! But test are all negative. Does this look like it could be a baby bump? It seems as if my lower belly is starting to swell. Insights please