Ovulation cramps?

Do you normally cramp when ovulating? Glow says I’m ovulating today and I’ve been feeling crampy off and on throughout the day. I know Glow is just a guesstimate of when your ovulation day is. Also, had unprotected sex with my hubby two days ago. I know I’ve read that you can feel implantation via cramps so I guess I’m wondering how fast it’s possible to get pregnant.