What does this sound like?

I'm not sure what's goon on, I'm 12 days late for my period and for the past week I've been crampon like crazy. No sign that my periods comin. I think I could be pregnant, but me and my boyfriend always use condoms, yet I kno theyre not 100% effective. Also I feel so tired lately, more discharge than normal, ive been super moody, the main thing are these cramps. They're pretty intense and mainly at night and in the early morning. I took a test yesterday and it came out negative but something's goin on. Going to retest in a few days also.