Advice?

Help please?! I’m not really sure what’s going on I know it can take a while for your body to go back to normal after having a baby and after being on birth control it also can take a bit longer for things to go back to normal. I had my daughter least year in June, but I wanted to wait to get on birth control after I had a normal period which I had a normal period in July of last year so I got on birth control (depo shot) I stopped getting the shot in February of this year. Now since stopping birth control I haven’t had any long periods but I’m currently trying for baby #2 but unsure if I can get pregnant with having such wonky periods. In may I had a strange period with absolutely no flow just some brown blood that wasn’t enough for a pad or a tampon only when I wiped and still haven’t started a period but my period app is saying I should start my period July 8th. Iv been taking pregnancy test and all are negative. Is there chance I can still get pregnant?