Some women experience a distended stomach during ovulation. This is because the follicles inside the ovaries are increasing in size, and are usually called mature follicles when they reach 18mm or more. When the follicle ruptures during ovulation, the egg is discharged and the follicular fluid is discharged, a series of actions that can cause a woman to feel bloated. If more follicular fluid is discharged, it will gather in the rectal recess of the uterus and the woman may experience a feeling of anal swelling, but this fluid will be slowly absorbed by the woman, so this symptom will get better in 2-3 days for most people. If you keep feeling swollen in your belly, you should also consider inflammation of the pelvis.