No period

Does anyone think a uti or bladder infection can cause a later period. My app I use suggested Id start on the eighth. I usually start around the seventh but two months ago is started the second so it took thirty four days to start last month but it started on the eighth. I took some pregnancy test, four early test that looked positive two regular plus another early test that was negative also a negative blood test all within forty eight hours but the test I see and family and my fiancé’s family sees are being said as negatives or invalids on here. So I’m just curious as of to why af wouldn’t have came on time. I’ve been cramping since Sunday.