When did you get your BFP

So I’m 6 days late and I have been testing since what I thought was 6dpo but I think my cycle was late. Anyways I keep getting what look like indents on frer or vvvvfl but on the dollar store cheapies they are neg. no signs af will come soon. I have been cramping since 6dpo and my boobs are tender as of yesterday. Why haven’t I got a BFP yet? Or a complete negative from frer?