Advice please!!!! :/

Hey ladies. I need some advice. So I just finished my fertile week. And I have been having really bad cramping since before my "green days". My highest percentage of getting pregnant was a couple days ago. So... What could be causing the cramping? (Its like in the middle not where the ovaries are.). If anyone is going through this or has this happened please comment. Thank you. And baby dust to all. And for those expecting mommies congrats. ❤❤❤❤