Pregnancy Phantom?

Hi! So I've always believed that I was unable to get pregnant due to a tumour in my Pituitary gland and the fact that to support this my partner and I do not use protection since a year ago and I've never been pregnant and my periods are normal and predicted. 
However, in the past I have thought maybe but a test came back negative; but I've never had this feeling in my abdomen. Now I am feeling like I am. Something in my head is saying I am. I've always had a baby bump (I look like I'm just starting to show) even though I am not pregnant. However I really think it's bigger, it feels harder not like the fat that was there before. I feel like I have a tingling/butterfly sensation in my abdomen; like light cramps that aren't bad enough to be painful! 
Also my last period finished on the 4th of February. I don't know what to do! 
(P.s this photo is a couple of days old and it was for a joke because I'd noticed when I put on my jeans it looked so big!)
Please don't judge, I'm 50/50 this is all in my head 😂