Menstrual cups

Hello I'm trying to find a menstrual cup I don't know anything about them I'm just having very long irregular periods from my nexplanon implant and I'm just buying tampons too often I figured a menstrual cup will probably be better and in the long run cheaper .. I just need recommendations for regular flow menstrual cups that don't leak

I read online that there are different ones based off of if you've had children or not and I do have one child