TTC, Weird pains no UTI or STD

Sa

Hi all, on the 26th I started having weird cramping/pulling feelings and twinges in my lower abdomen. Then my lower back started hurting a LOT. I thought maybe it was a UTI that turned into a kidney infection from TTC. I took an at home UTI test and only one pad changed color. I looked it up and it was the one that detects white blood cells, but not bacteria. Internet said it still could be an infection, so I went to the doctor, but that cultured and just came back completely negative from the doctor. They said definitely not an infection. I also went to the gyno a month ago and I definitely do not have an STD.

Any idea what this could be??

I am pretty sure I ovulated on it around the 23rd because I had cramping. This is also a day before the app predicted. I know this isn’t the most accurate way to track, but that is not what I was trying to do. Just noticed the cramping. I thought it was too early to have pregnancy symptoms or even test.

Has anyone had these symptoms for anything, pregnancy or not?