Sick & miserable & pregnant??

This month my period was late and when i got it it only lasted two days. I took 4 tests. I know its easy to get false negatives on those but 4 false negatives seems farfetched. Now less than a week after my 'period' ended im sick. Its like a severe cold.. I cant breathe through my nose and still feel as if im not getting enough air... I feel like my throat is coated in sand and my ears ache... My mother says im probably pregnant and need to see the doctor but i still think its a cold and just an odd month and also i dont want to get my hopes up. Should i see the doctor or just let it pass? Could i still be pregnant or probably not?