Ovulation

Y’all I need some advice, I’m new to this TTC and using ovulation strips. I already have a baby but with him he was a complete surprise we weren’t even trying! and this time around were trying and nothing😔 we’ve been trying for 2 months so I’ve been using ovulation tests and so far nothing. This time I started testing ever since my period ended and I finally got a real period since I gave birth so I’m crossing my fingers it works this time. But I am confused tho, I had a really positive ovulation test yesterday morning and we baby danced but when I tested again during the night it was negative. This morning I tested again and it was negative so I’m wondering if I am doing this wrong or is I received faulty tests. I need some advice please anything helps