My period was supposed to start yesterday. I took pregnancy tests a couple of days back and all negative but I didn’t take them first thing in the morning. And I know it’s only one day late but I’m curious of this..I had a bad bladder infection hit me three days before. So could my bladder infection interfere with a period?? This infection was so bad I was in excruciating pain and couldn’t sit still or get comfortable anywhere. Almost had to go to the E.R.