OPK Question

Hello Ladies!

Hopefully someone can help me. My Dr. advised me to get an ovulation kit and start charting. But there are so many!! He said to go into the drugstore and speak with the Pharmacist and I thought no biggie right?! So. I’m asking this lady about opk’s and she’s looking at me like I’m from another planet. And she says, “Any on the shelf should be fine, they all work the same.” 😳 I ask do you which has the least return rate at least? Or do you get the least calls about? She looks at me like I have 6 eyes. Okay, ma’am I’ll check the shelf.

So my question to you ladies which opk’s do you use? Are they reliable? Thank you! 😊