Suggest Treatment For Irregular Periods Inspite Of Trying To Conceive

Hi I came off my pill may 2014 I had my break through bleed as normal then had a period on June 21st. I then didn t have a period July or August, had a period on September 5th then October 5th nothing in November, again had a period on 23rd December then nothing again in January 2015. What s going on? I m trying to conceive and it s very frustrating I don t no if this is normal or not.