Hi I'm 2 weeks late and have little cramping and headaches but no other signs of pregnancy what could this mean?

Irregular periods. There are lots of reasons a persons period can be late. If there is a chance you could be pregnant then you should repeat a home pregnancy test. If it is negative then waiting a few weeks to see if it returns is reasonable. If it does not then it is time to visit your friendly obgyn doctor to discuss irregular periods.
Check for pregnancy. Always check for pregnancy but you may not have ovulated and can then skip a period or have a late period. Thyroid abnormalities can sometimes cause this also.