Menstrual cycle

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My menstrual cycles always been crazy as I’ve gotten older and had children it got normal. As I’ve had the marina in for over two years I took it out July 3 and I’m trying to conceive I’m just kind of wondering because I know it’s as far as getting pregnant check after your period five days and all this stuff but I’m a person like I said who had funny. So I’m wondering like if I should probably go longer or sooner to check for pregnancy just because I don’t even know when my period start