It took me two months to get my first period after getting implanon out. And then they were weird short cycles for a couple more months. Things settled down and we were blessed to conceive 5 months after the implant coming out.
I tried charting with OPK's and temp checking for a couple of months to work things out- but we conceived when I stopped using all that. Charting puts a lot more pressure on so I personally would try not to get too serious about it in these early days.