Ovulation

Hi ladies

I 100 percent ovulated this past Sunday. I always feel cramps on one side of my body. I still feel like I may be fertile today as I did an ovulation strip and it was positive

Could this be? I thought the day after ovulation is the best day which would have been Monday but a few days prior works as well. Today is day 15 for me. Can strips lie?

Any advice or info is appreciated. First day of next period is June 2nd. Thanks