I’m hardly getting a control line ?

Tayla🌼 • Two daughters 🌸🌸 13month Gap. 👶🏼 👶🏼 👼 healing from loss 😭 at 11 weeks pregnant. NOW -🌈 👶🏼 on board

On my opk I’m hardly getting a control line it’s almost not visible it’s so light ?? Why would this be ? The opks are damaged ? Or