IUD Question?

Gina
Girls I been with the Mirena IUD.. for one yr now...and my period been on time for the last year but I didn't get my period on this month (may).. I should have it 3 weeks ago an nothing.. but I have pain in the bottom of my stomach and my breast are tender.. I am little worry that I could be pregnant.. what do you think girls.. should I make a pregncy test??