Need Answers Please

Okay so I use to be on the depo shot for about 3-4 years well now I've been off for about 2 years. Last year of April I had a miscarriage at 3-4 weeks and every since been so hard for me to get prego and I have regular periods ever month like normal but sometimes I don't even know when I ovulate because I do not see it in my panties. Any ideas ? /: