HELP!

Monique

I haven't gotten my period since 9/21. I didn't have one in October, I still haven't gotten it, I should of gotten it around the 26. which means I'm late, I always have a period every month. my boobs feel sore and my nipples are sensitive. I don't normally feel this with AF. I took a test this morning and it was negative. I don't know why it's late or why I got a negative test.