Fertile cramps??

Is it normal to have cramp during fertile window? I’ve been having period like cramps during my fertile window for as long as I can remember, there was one time when I was ovulating (according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>) I was in so much pain for about 30 mins with cramps. Is it normal? I’m a feeling the eggs move? Idk why I have cramps like this. Anyone ideas?