Help only in my 20s and this is the first time

I have been off the depo shot for 9 months now and in the beginning I didn't have a period for a few months then I haven't missed a period since then but I have been trying for my first baby we have been trying for 3 months but last month I didn't get a period or anything I have taken 2 home test and did one at the hospital all say negative what could it be I'm waiting to go to the ubgyn but kinda wanting to know before Plz help thanks