I've been experiencing irregular periods since ovulation, about 3-4 da…

I've been experiencing irregular periods since ovulation, about 3-4 days after. My period is around 1/2 hour long. I feel pressure in my lower abdomen and it feels like it's moving around. It feels heavy on both sides of my body. I think it's getting better but I don't have any pain. Could this be related to menstrual cramps?