please give me your opinions!

okay ladies I am new at this me and my husband have been trying since last June. I have been off the depo shot for a year now and nothing. I'm getting really really frustrated because this month I thought would be the month I still have not had a period this month I have taking two home pregnancy test and they were both negative I had to go and have a CAT scan done last Monday for "other" reasons and I made them give me a pregnancy test before I went back and it was also negative. Any opinion?