Nuva, Depo, Nuva, now irregular

I have been TTC for about 3 months now. Right around my 3rd period is where I saw problems. I used NuvaRing for a few months and then switched to Depo. The Depo made me bleed for about 6 months straight. I only had the shot twice because I couldn't deal with all the bleeding. I switched back to Depo and within the second ring we decided to have a child. My first period was a bit irregular because the bleed days were shorter. The second was a fairly regular cycle. The third, well I haven't had one. Today is day 52 of my cycle. I test randomly with Wondo pregnancy tests and nothing. I know BC can mess with your cycle, but gosh it's discouraging me because I was ready to chart away my ovulation days. Now, I don't know what to do.