Are ovulation tests usually positive right before you start your period?!?

I miscarried in late January and haven’t had a period since. Glow predicted that I would be in my fertile window this week, so I decided to try out ovulation tests for the first time. It was almost positive on the night before last and last night it was definitely positive. But I went to the bathroom and had some blood today, so I’m a little confused! Is this the start of my period? Are ovulation tests usually positive right before a period?

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