Feeling annoyed and upset

Ta
Well I'm due AF today. No sign 4 bfn. Temp had a dip and feeling like rubbish! Just feel like giving up and going to bed and crying :( I'm never late. Always between 28-33 days and it's cycle day 33. Got a positive opk Friday the 15th I think it was. So it works out that it should be today? I dunno.