If you have been trying for 6 years it is very unlikely it will just happen. You need proper investigation including sperm test for your partner and an ultrasound scan and blood tests for you. It is also advised to check if your fallopian tubes are not blocked. This can be done as an out-patient procedure. I would advise you to have a fertility MOT which will do all the above tests and give you the answers to your chances of conceiving naturally. Problem with your period should be discussed with your GP who should be able to give you advice based on your medical history.