Anyone ever experienced this?

Hey me again really looking for some positive reply’s.. I’m 21 days late 7 negative tests. My cycle has always been a bit irregular like most peoples but not like this! I’ve been cramping for a week like AF is going to come but nothing..I had a small bleed on the 22nd of October for like 2 hours then nothing..my and my fiancé are wanting to start trying for are 4th baby but I was wondering if I miss this period complete (I’m due again in 7 days) is it possible to still try or how would I go about it? Like I don’t know when I ovulated or if I did? TIA xx