Question about an Opk test

Coco • Im coco im 32 TTC with my fiance my 2 babies were both 24 weeks which ended in stillborn waiting on my 🌈 👶🏽👶🏽
I ovulated Saturday June 4 I'm now 5 dpo I took an Opk this morning and I'm wondering why they are getting darker I know u stop after your 1st positive mine was a while back but I had to pee on something lol any insight or advice thanks