Opk test , when to take them and stop ?

So I got a positive opk test yesterday, also BD soo 🤞🏾🤞🏾🤞🏾💗. But afterwards I test again like 2-3 more times and they still said positive. Then I woke up this morning and said let me jus check cause last time I got a positive and didn’t BD, it went back low again. This morning it still says positive. Or does it stay positive for a while ?!