Hi Sloane. Welcome to the world of ttc. I am currently on my 2nd cycle since coming off the BCP and started charting the second my "withdrawal bleed" began. If you check out my ff link in my signature you will see that my second cycle after a real AF is very similar to the first cycle since coming off the BCP so I think it's fine to start charting right away. Also, just for interest's sake I have a few friends who actually fell pregnant first mth coming off the BCP. They thought it would take a few cycles for their bodies to regulate and fell right away (2 before their wedding when they went off just before their wedding thinking that by after their honeymoon they'd be ready to start ttc). So you never know! Best of luck hun.