Feeling so rubbish, could this app be wrong?

Michelle

My App says I’m supposed to ovulate tomorrow but I’ve had Negatives on OPK’s for the past few days, i May have ovulated already, could my app be wrong? I’ve read that Pregnancy can only occur if ovulation takes place on or after CD 12, if I’m lucky I could have ovulated CD12 but if I’m not sure if I’m ovulating at all and feel it’s probably down to being over weight :(