Questions about late period?

So my period usually comes around the 25th or 26th of each month. But last month I got a really bad virus and was really sick so my period was delayed to the 29th. My cycle is around 31-32 days. This week I has been very stressed emotional, although I've still broken out like I do every month a week before my period I just haven't gotten it yet, and its the 30th now. Will these things cause it to be delayed? I took a pregnancy test today, and got a negative result.