Opk line strong on cd 7? Just came off cycle (cd 6)


Hey ladies so I just took my 1st opk at 6pm this evening and I know it’s negative but I would’ve expected for the line to be almost non existent considering I just came off my cycle yesterday. I’m currently cd 7 and I was reading that I should test cd 11 based off my cycle length. Does this mean my luteal phase length could be shorter or I ovulate right after my cycle vs ovulating a week after? Has anyone else had this experience before? That’s probably why I missed ovulation last cycle.