Possible pregnancy?

Okay guys so I’m not on the pill and haven’t been for about 3 months now and me and the hubby aren’t “trying” just yet but we’re not exactly being extremely careful. 😂 I’m anywhere from 4-6 days late on my period (I know last month I started either on the 12th or 13th) and I’m usually not late. I’ve been a couple days early but never really late. Yesterday I took a pregnancy test and it’s negative. Has anyone ever had this happen and actually been pregnant? Thoughts? Help 😂😂