What is wrong with my body

Jackie
Took Plan B and havent gotten my period for two months now. I took a pregnacy test 2 weeks ago and it was negative.
 I took two pregnancy today and they both where negative. Has this happen to anyone eles? Please help me I dont want to go to the dr. I dont have insurance. 
I have no pregnancy symptoms 
Whats wrong with my body. Is the Plan B still be messing with my body?
Last period:   02/04/15
Had sex on:  02/16/15
Took Plan B:  02/16/15
Todays Date: 04/05/15

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