Confusin with Opks

Hi girls! Thanks for reading. Basically I have taken an opk everyday for the last four days and and the line has been getting stronger and stronger. I understand its only positive when the lines are equal to each other and they have been for the last two days both really strong pink lines. How long should it stay this way for please? New to ovulation tests! Any advice is greatly appreciated! Baby dust xxx ❤❤❤