Need some serious advice!

I'm on two different ovulation and period trackers. Obviously this being one of them. But I've gotten loads of different ovulation dates...

Last period I had was the 21st of April til the 23rd. According to the other app I'm on I should of ovulated on the 5th of this month. But according to this one, I should of ovulated on the 6th of this month and again on 24th of April..the day after my period...im all confused and I had this yesterday when I wiped but nothing since, plus my boobs are so sore. There's no way I'd be pregnant surly.