Why is my period late?

According to a period calculator, I was supposed to get my period on tuesday, and its now saturday and it hasn't come yet. The last time I had sex was about 4 1/2 months ago, and I've been having regular periods since then, no weight gain, no morning sickness, sore breasts, no pregnancy symptoms, and I've taken a couple pregnancy tests that all came back negative. So I'm sure I'm not pregnant, but why is my period late? I've had a sinus infection for the past week and a half, and I've just now getting over it, so could that be the reason why my period is delayed? Or is it stress? Work is not really stressing me out but this whole late period thing is. I keep on getting mini cramps like usual before i get my period, but after those, nothing happens. Have any idea whats going on here? Any help would be appreciated, thanks...

Why is my period late?soap opera

Calculators aren't accurate.

Your body is not a Swiss watch, and it does what it does when it's good and ready. You're not yet.

Why is my period late?city opera opera theater

why is your period late? maybe it forgot to set the alarm clock.
You could either be pregnant (take the test to find out!)

OR you could be under a lot of stress.

or you could be worrying about it too much! (don't think about it and it should come!)

OR You are changing your dates to when your getting it (like mine changed from the beginning to the end of the month like in a flash!

hope I helped ..

ps.. if it's really bothering you, you could talk to a physician!

x
This can be due to a lot of things like stress, change in diet, change in exercise routine.

Also, the days can vary, it won't always be exactly the same number days apart.
I t happens from time to time ...calm down! I think your just jittery because....you haven't had sex in 4.5 MONTHS!
coz you pregnant !!
You've had regular periods since you had sex so you aren't pregnant. I have a regular 28 day cycle and occasionally I'm late. Once my period was 3 weeks late - I was petrified! Sometimes this happens - don't worry - it will come. The infection you've had has probably had alot to do with it.
It might be a good idea to go to the doctors and they will be able to tell you wots up one way or another and this will put your mind at rest.
Your body is not a clock - very few periods come at exactly the same time every month. Your period could be late for any number of reasons - the fact that you had a sinus infection can definitely be one of them, and stress is a large possibility as well. Also, a period which is late by less than a week is not really considered "late."

Don't worry about this at all - I was once two weeks late because I caught the flu at the time I was supposed to get it. Relax, OK? ;-)