Period then positive test??

So I ovulated on 12/1 and then got what seemed like my period on 12/9 that lasted 3 days.

Today I had some spotting, but decided to start ovulation tests for the month and it was positive. I just randomly decided to take a pregnancy test too... it was positive too and then a different pregnancy test was also super positive. I’ve had slight cramping, but tender nipples.

What can be happening?? I’m calling my OB tomorrow, but wondering if this has happened to anyone.