Need Advice on Late Period !!

Brittany
I Took Plan B January 10 a Day Before My Period Was Over . && 1 Week later I Had Blood on The toilet Paper . && It Been 2 Months that I Haven't Had My Period .. 😞 I Took 6 Pregancy Test & All Came Out Negative . & I Always Take them In The Moring When I Wake Up . Buh My Next Period Is I'm A Couple Days On The 30th . 
 Any Edvice ?? 😭