late period

hi guys, I'm new to this so Idk exactly what I'm doing lol but I have a question. so I have irregular periods so it's normal for me to be a bit late. I was supposed to get my period since the first week of this month and I still have not gotten it. my boyfriend and I are wanting a baby but not necessarily trying we just don't prevent in any way so I did try taking a pregnancy test about 10 days after my missed period because I thought it night be that but it was a clear negative. the next day I got a bit of spotting for about 3 days after that it wasn't enough to like stain my clothes but it was just enough pink for me to notice when I wiped. So any suggestion s on what it could be ? I'm just lost at this point