I have been off the pill since April & have had regular periods since. My last period was Nov 27 & I was due Dec 25/26, however my period is now late. My husband & I have been trying 2 conceive & I thought I might be pregnant but after 4 negative pregnancy tests I'm not sure what is happening!! I'm not getting my hopes up, but after such regular cycles I'm confused. How will I know I'm definitely not pregnant & when will I ovulate again??