all periods have always been every 28 days since i started. i have had the contraceptive pill for 2 years then last november came off it to try for another baby,periods returned after a few months no luck at getting pregnant then last month i had a 31 day cycle. came on thouhgt it was a one off.i now have had a 34 day cycle done a pregnancy test not pregnant. could you give advice on why and if theirs a problem. should i see my doctor about this and not getting pregnant %-)