Tired of negatives

When I was eleven I started my period, the quickly became regular. At 17 I started taking a lot of medications because I was sick and for a year I did not have a period. I stopped taking my meds and slowly got my period back. For the last 2 years my periods have been weird... Yet normal. I've been tracking and they are Usually about 23 days apart. I'm trying to conceive so I have been tracking the whole time. Every time I have sex when I'm ovulating it seems as if my period is late! I've even had a 77 day cycle then my periods go back to 23 days for a few months, we try again and there's another long cycle. So I've taken tests a few times because I could had conceived and they have always said no. Is this me or him? I am a week late right now and my nephew told me I have a baby boy in my belly, and swears to it. I am so tired of being let down, I don't think I can handle another no right now.