TTC after Sayana Press!!!! :(

So, I only had one shot of Sayana Press (pretty much the same as the depo shot) back in June 2019 I decided I didn't wanna go back because I wasn't getting any periods. Before I went on it my period's were all over the place for some months at a time due to stress. I never went back for my next jab which was September 2019 I was hoping by now my body would be back to normal. I had a little light bleeding (only when I wiped) for some weeks afterwards then nothing until the 11th of December which seemed to be my first proper period prior to getting the injection. Seemed just like a normal period no different than any other month. I've not had one since we're now coming to the end of January I've taken endless tests all of which are NEGATIVE, I don't even know if I'm ovulating. I've recently started using the OS I'm finding them difficult to read as I have no idea when my period's are meant to be, first month of TTC and it's already stressing me out!