What does this mean? How worried should I be?

I’m 41 day’s late in my period. I had a uti that I left untreated (well I used home remedies like drinking fluids and always using the bathroom when I felt like I had to go etc) I took two tests and they came out negative. I just learned that by not medically treating a uti can cause a kidney infection. Could that be the cause of this?
I’m worried about this
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