UTI symptoms but no UTI, almost at missed period.

Taylor • 24 - Married July 2015 - TTC for 54 months - PCOS -

Hey guys, so my husband and I are ttc & have been for a year. Yesterday I started having this weird intense bloating / sore and heavy lower abdomen (in the center) and frequent urination, thinking it was a UTI I got tested and it came back negative. I have seen things online saying this could be a pregnancy sign (never been pregnant & never had this symptom before)

I was wondering if any of you have ever experienced this & if so what was it?