Missed period but positive opk test

Ashten

So my period was “supposed” to start exactly 2 weeks ago but I keep getting negatives on preg tests. I randomly tested on an ovulation test and a pregnancy test today bc I’ve seen you could get a positive on a

opk when you’re early, the opk was a fat positive but the pregnancy test was a bfn. This is new to me and I’m just looking for answers as to what it means. The internet isn’t helping much.