SInce having kids, I've noticed when I ovulate each month, I get a pressure type discomfort in my lower abdomen. It lasts 2 days about. What is this?

Mittelschmerz. Also known as ovulation pain. Some women get pelvic pain every time they ovulate. It usually lasts 1-2 days and is predictably around the time of ovulation every month. Ibuprofen or Naprosyn (naproxen) help.