The reason women can feel symptoms is because when you ovulate, a small cyst forms on the ovaries where the egg burst from. It will cause hormonal changes in your body that can cause you to feel symptoms. If you want more info, google "Lutein Cyst" or "Luteal Cyst".
I should also say that every woman is different, so some may have had other symptoms and earlier than I myself experienced them.
No, I never experienced anything that soon. My first symptoms of all of my 3 pregnancies have been bloating, cramping, and sore breasts. All PMS symptoms also. I always got these when my period was due to start, and when it didn't within a few days of that, I would take a test.