Help?

I had positive OPKs on CD 17, CD18, and CD19. Would I have ovulated after the first, second, or third positive? I can't find anything anywhere. I don't want to wear myself and my fiancé out by trying too much and too often because we've been trying since two days before the first positive. I had cramping on CD18 and that was the day with the darkest positive and it started fading by night time on CD19.

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