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The change in your period pattern will require further investigation to find out the cause for it.
For the conception problem, you will need to be examined by your doctor/healthcare provider/gynecologist to look for underlying causes. After examination, further investigation would be necessary like your CBC, pelvic ultrasound, hormonal status etc.
If all the test results come back normal for you, a semen analysis for your partner needs to be done to look for any abnormality in sperm quantity or quality.
Schedule an appointment with your doctor and discuss these points with him/her.
Hope this helps.