Resetting period calander?

Julia • Married to my love and ttc! Trusting in the One who makes all things possible. ⚓️
When I first signed up I hadn't had a af in almost 3 year so I just put the longest numbers into my profile and now that I got af I can't change it. It won't let me delete pink circles in the calander. I updated my info under settings but it doesn't change the calander. Is there a way to reset it all and start over?