I've missed my period twice now. I have irregular periods so there has been times where I've missed one month, but I've never gone this long without one. I'm not on any birth control or any kind of medicine that would cause me to skip a period like this. My last period was the beginning of April and I've taken pregnancy tests, but they all say negative. I've felt really nauseous and I've been throwing up alot lately, but it could be that I've missed my period due to stress and I just happened to catch a stomach flu at a convenient time. I just feel like if I was pregnant then I would have a positive result by now. So, is it normal to sometimes go this long without a period?