Confused . late period?

Hannah
According to glow my period is due today. But I didn't have my period until July 7th it's only August 3rd . I don't understand . I start between the 6th and tenth every month . I have it logged that way on my period log as well . how accurate is this ??help? Also i had a uti last Monday and everysince them I have pelvic cramps. My uti culture stayed it was negative for a uti bc bacteria did not grow but I know what one feels like I know I had one .every since then I've had pelvic cramps and slight discomfort . idk when to test . this app says I'm supposed to start today but like I said I never start until the 6th or so. Can pelvic cramps for a week be a symptom ?? I don't want to be disapointed . we've been trying for almost 6 months now 😳 I'm starting to worry about my health . and yes I do have an appointment with my gyno in the a.m. I just wanted to let out my feelings at the moment and get some advice maybe?