I have always had a normal period. I missed my period in July it was suppose to be the 29th and I finally got it August 6th it was heavy compared to all my other periods and it lasted almost a full 8 days when it is usually just 3/4 days. I was suppose to get my period yesterday and haven't I don't even feel like I'm going to start. I have took 3 pregnancy test after my 1st missed period and all 3 said negative. I have been very tired, moody, and felt sick or have got sick. I am not under any stress so what can it be?

It's possible that your period is just out of whack at the time. Although regular, every once in a while we get that odd period that is either late or early, short or long, heavy or light.

I would suggest you wait another week to see if your period comes. If not, by all means, test again. Be sure to use first morning urine when doing so.

It could just still be too soon to test. I would wait a few more days and try again, make sure you're using first morning urine.

Have their been any changes to your diet or exercise? Any changes in medication? Especially with birth control? If the tests continue to come back negative, and your cycle continues to be irregular and the symptoms continue, you should definitely speak with your doctor