Worried and Sad!!!

I was on pills for 2 years and I changed for depo and I took for 6 month and I'm 6 month without taking anything, and my doctors says that I can already start on ttc because we are okay and into now I didn't conceive did something like that happened to you guys? What you guys did? I already try everything but now I started on Pre-Seed they told me that it's really good