It depends on your landlord's requirements. Some offer a "grace period" after the day rent is due. If you pay your rent late, they are usually allowed to charge a late fee.
Yes you can! I was once 4 weeks late on a period. I went to the dr for a blood test on pregnancy and that came back neg. I got my period 4 weeks later. My dr said I ovualated late.
If you haven't had your period by the time you're 15, then an OBGYN might want to investigate why. There are many reasons why a girl might not commence their periods, some might include being...