I'm 36 years old and not currently using any from of contracepives. In OCtober my period was 2 weeks latee than normal, then I had 3 with only 2-5 days in between. I had my normal period in December but now the same thing has happened again in January. I have been off work with severe low back (and a hip problem ) for several months. As the back pain hasn't been explained I am concerned that there's some sinister connection between the two.