Confused??

Sierra

Since getting off birth control I’ve had three regular 26 day cycles. This month (cycle 4) was my first month using OPKs and I got my first positive on CD 16 meaning I ovulated on day 17. I feel like this is a bit late for a 26 day cycle. Fast forward to CD 23 a week later (7 DPO) and I started spotting pink and brown which got me excited because I thought it could be implantation, but then later in the day it got heavier and has continued into the next day. I’m just so confused how the first three cycles were so regular and now this one is so early and came only a week after ovulation. Any help?