Confused!!

Does anyone have any experience with the Premom app ??? I've been logging my opks on there and it gives the numbers to say how high the LH is... but my ovulation date keeps changing. And then today with the peak this later morning (was NOT fmu) I thought it was my peak and it is still telling me ovulation is 6 days away????? I actually thought my peak was on thurs... but today the opk was darker.... but I'm also confused because my temp went up this morning and now I'm not sure if ovulation was actually yesterday..... please help !!!