Missed period for 4 days

Me & My husband really want to have bb, last month on 15th Jan We have sex.. after a week my breast getting tender, I feel dizzy especially in the morning plus I am hungrier.. I read and watch many comment on ' Google and Youtube' that is the symptom of pregnancy So, I was very happy and waiting to see it. 
And this month It suppose to have period on 1st Feb but till now my period not coming yet! I buy 3 pregnancy testing and the result is Negative :(((((
I am so stress now, don't know what is going on with me .. as I never miss my period before plus I still have all the pregnancy symptom! 

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