Period is 4 days late every month

Hey guys, I'm new to this app. So, basically the problem I have is that each month for the past 3-4 months I've been getting my period 4 days late. I don't know if I should be too worried about it. I have been told that I have a small kidney stone from a recent scan that I had. As I do get UTIs very often. I have asked my doctor if them two things combined could be affecting my cycle but I was told that wasn't the case. I just wanted to ask if anyone else has had a similar experience & what do you think I should do? 

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