Has anyone gotten a false positive on a digital OPK?

This is my first month using an opk so I decided to test as soon as my period was over to get the best results. Well I tested yesterday afternoon at CD5 and it was low. I didn’t test last night cause I figured I was super early and would just get another low and waste a test (I’m using clear blue digital btw). So this morning I go to test again (CD6) fully expecting a low cause according to the app I’m still 9 days away from ovulating but instead got a peak. I’m wondering if there was an error or if I really do just ovulate this early and didnt even know it. Already BD today and plan on doing it again tomorrow just in case it wasn’t an error (on top of BDing during what Glow says my ovulation is of course).

I guess my question is, has anyone gotten a false positive on their digital test before? Or are there any other women who ovulate this soon after their period? I just didn’t think it was possible to ovulate this soon after AF so I’m leaning more towards error but I’ve never tracked it before so who knows! Let me know your opinions, thanks!