For the past three days on and off, i have been having pains in my pubic bone. why? is it because my period is coming soon?

Could be: However, you could have a muscle strain. It is also possible that you have had trauma to the area. Try some ibuprofen; if the pain does not improve, see your doc.

Possibly: That is not a typical pain associated with a menstrual cycle. You could wait and see if it stops after your cycle comes. If not then schedule a visit for an examination.