Ovulation ?

My <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> keeps telling me from the info I have provided I am ovulating today but on my ovulation tests I haven’t got a positive yet and it’s cycle day 28 ? Just an almost positive and then after that nothing 😕 have been testing several times just in case 🤷‍♀️ I’m lost now