Pregnant?

Hey, I'm trying to figure out what's going on. I'm 12 days late, I've been experiencing some cranping like my period is gonna start but still no period. I have been pretty tired but other than those 2 symptoms I haven't experienced anything. My cycle is usually regular I've never been more than a day late before. I've taken like 10 hpt's but they've said negative. I'm not stressed or anything like that, I've been trying not to think about it. I just wish I knew what was going on! Can anyone help?