Hello, I am 31 year old female. We have been planning a family since February of this year and in march I missed my period, I was feeling like throwing up, fatigue and very sensitive breats. I took several pregnancy tests but they all came negative. the symptoms continued till I finally had my period on April 29. now it is happening again.my periods were due on August 29. I feel nausea, mild dizziness and fatigue all the time. and breasts feel tender too. my periods till now have always been regular. what could be the issue.