i'm a bit confused

Emma

okay so from my understanding you can bleed right before ovulation, correct? so i was bleeding may 7+8 and a little bit of the 9th. i've a little bit of cramping that comes and goes, i get super tired, and all the sudden i drink a lot of water. but according to the app i was ovulating yesterday. i'm not sure exactly what any of this means, can someone help me