Don't know what's happening..

Okay so I've never had any issues with my period. I've always been able to tell you when I will start and how long it will last and its always been the same. I started birth control before my wedding just to take precautions and my first month I spotted the week before and then had my period like I was supposed to according to the pills.. well I am now 2 weeks late this month. My breasts have also been super swollen and they hurt more than they ever have. I took a test on Monday and it was negative.. idk what to do....