Any advice ?

I really just want to give up. All I want to do is have a baby but it seems so hard. I believe that I have an irregular period. My period last for 5 days, but each month the time between my last period and the next one is always off. Sometimes it's 31 days apart, sometimes 32. Is that irregular ?? Also, I missed my predicted period for this month & I am currently 5 days late but still getting a BFN pregnancy test. Has this ever happened to anyone else??? What should I do at this point?