Pregnacy planning

So I am 20 and I got on birth control the depo in 2017 and I only used it 3 times and I stopped I didn’t have a period in a year then finally in the middle of 2019 I got my period in June and I first time experience irregular periods I mean I was going 3 months without it then it finally came but my cycles can be 32 to 43 long and my period days last 5 days and I am currently engaged and we been planning on a child for 4 months now and it’s been a no go cuz I can’t catch my ovulation every time I do it’s egg white then it turns milky afterwards so I am now I usually get wild the day of my period cuz it’s barley anything and the last day the only time so I just got off my period on December 30 so I am using preseed now to see if this will work I used it on dec 20 I am using it every 3 days let’s start my journey we are wanting a boy!!! Pls pray for us.