New to ovulation test


I just started testing. Literally test yesterday at 924 pm was negative. A faint line but negative. Today at 12 something or maybe 1 something I don’t remember exactly I’m sorry. It was positive. Test line was darker than control line so it moved my ovulation date to tomorrow. This is what my cycle looked like before I tested it today and I’ll post what it looks like today in the comments. Just want to know if it’s normal to be esrly by a few days or late by a few days? I’m not ovulating testing to get pregnant just to track my periods better!