Didn't have my period at all in january

Callie
Hi I'm Callie, this is my first timw using this app, well here it goes. I haven't my period at all in January. I am roughly 12 days late and I've taken 2 tests and both were negative. I'm a little worried, but what do I do? Please I need advice. My fiance thinks I'm pregnant but like I said each test has been negative.