losing all hope....

heres my story i started depo in may (2015) after a misscariage i had in 2015. and then stopped november of 2017 and didnt get my next shot which was spose to be january 2016. so its been some what over a year . and my june period was late , normally i have (24 day cycles) and my june one came on cycle 35 , then for the month of july my period came as nomal on 24 day cycle . this month again it just came 4 days late (on 28 day cycle) before the month of june i had normal 24 day cycles . not sure why they changed . would it having to do with the depo making its way out of my body and my balancing out ? cause me and my partner have been trying since valentines day of this year to get pregnant and each month comes and i always get negtive tests . before i was on depo i never had a problem getting pregnant before and its is very frusterating . curious if anyone issue can relate to this or have any tips or had any luck getting pregnant after beening on depo for a year?