missed period with mirena IUD

Gabriella
Hey ladies! 
So I've had my IUD since end of August 2016 and I had my period about every month until December 2016 (I was supposed to get it the 15/16 or December) and it still hasn't showed up and we're going on like four weeks with no period. I'm nervous becuase I had let my guy finish in me the 14th of dec. I feel stressed becuase of family issues and I feel bloated. Is this all normal? I feel it's too early to test yet