Late again....

I'm 32 years old and my period has ALWAYS ALWAYS ALWAYSSSSSSS been ON TIME!! Last month I got my period 7 days late. The only 2 time I was late I knew I was pregnant, 12 & 7 years ago. Last month was first time in 7 years I was late....but got my period 7 days later.....ok I thought was just late, we'll....last month I got it the 19th and AGAIN this month NOTHING again....LATE AGAIN!! It's now the 24th, no I'm not pregnant....could this be stress?? I'm in the middle of wedding planning, I get married in 32 days to be exact....I'm so nervous because I go from being on time, to late twice in a row! What could this be???