Negative tests the day af is due

I just wanted to share this with some of you guys! I tested the day of my expected period and got a negative which I assumed meant for sure I wasn't pregnant because with baby #2 and #3 I found out at 12dpo and 10dpo but af never came and this morning I was 2 days late and pretty heavily suspicious that I was pregnant (still no af and my cycle has been like clockwork for 5 months) and bam I got my faint bfp. So I just thought I'd share on here that you can get a negative even if af is late! I figured it would show by then but anything is possible