What should I do??

I was meant to get Af on the 15th I tested on the 16th Bfn.. I was getting signs I was pregant. I tested again on the 19th still Bfn... I still haven't revived Af yet.. 
​Doc did say coming off the pill I might miss a period! 
​Will I see Af soon or when it is due next??
​Or should I go get tested by the doctor??