OPK tested twice w different results

Hi! I am on the CD9 and i am supposed to ovulate between friday and saturday. I had an OPK yesterday and was low. I testes today again and it was High Peak, which was weird for me. I tested again a couple of hours after ( i had an extra kit) and it was low. I am very confused! Any thoughts? Someone w a similar situation? Thanks and baby dust for all of you!