Ovulation test advice

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Hi there I’m just wondering if ovulation tests are suppose to go to 0 after ovulation? And what happens to ovulation test when you actually conceive, do they go back up or stay low? I’m still learning, recently had a mc so hoping to conceive again soon 🤞🏻🤞🏻

Tia, any information regarding ov tests and what cm should be after ov/ early pregnancy will be so appreciated (currently have a lot of lotion like cm)