Your last period was on 26th of march and on the fifth you had headaches with nausea and vomiting and felt dizzy all the time you've done pregnancy test on the 11th of march and it was negative. yo?

you took the test too early you had your period on the 26th you missed your period this month? correct take another test or go to your doctor for a blood test which is 100% accurate on results of pregnancy because the symptoms you are having can be signs of pregnancy so find out soon hope everything works out for you Good luck and God bless!!!