Well she is pregnant, I felt baby movement tonight! And yes I put her on a diet immediately! Thank you for advice!!Pigs like sex a LOT, so yes, neutered males will still do it. If they were more than 3 weeks old when fixed, they've already got the urge (many farm pigs are neutered at about 3 days old)
Your girl doesn't look pregnant right now, just fat. You can see the fat building around her shoulders and the ridge above her leg muscle and there's no udder development.
Now, that's not to say she isn't, because especially if it's her first, sometimes they don't show signs until right before, and a fat pig hides a pregnancy well. But if the Mr isn't fixed, his "boys" will be pretty noticeable.
Whether she's pregnant or not, put her on a diet. She can have all the hay and green veggies she wants (they will eat a LOT of hay) but seriously restrict her grain and starches. Like, lots of zuchinni, easy on carrots and potatoes. Potbellies were bred to get fat on a high-fiber diet and get seriously obese on grain - it's like feeding a kid a steady diet of cake. It's a nice treat, but not a mainstay. Especially if she is pregnant, you don't want her fat - it can lead to a difficult birth. I've raised potbellies for 8 years now, and birthing difficulties are the leading cause of death, but can be almost totally avoided by keeping them fit. Diet and exercise is the trick.