I got implanting 9 months ago and it seems like I have a period every two weeks that is dark and very clumpy. I also get occasional pain where it's at?

Nexplanon. I am assuming that by implanting you mean that you had a cotraceptive implant like Nexplanon inserted into your arm. One of the frequent side-effects of the implants is irregularly irregular bleeding that occurs and often continues for the entire time the implant is in place. Scar tissue forms around the implant and can cause occasional pain in some cases. Hope this helps.