5dpo feeling sure I'm not pregnant

this sounds mental but I'm 5dpo and if someone said right now are you pregnant I'd say 1000% no I'm not saying I'm pyscic (sorry can't spell) or anything like that but when I was pregnant with my son I just knew it sounds mental I know i just knee 1000% i was even knew I was having a boy like when they told me I'm like yea I know. I had a tough month last month got to my period being very late faint positives and then got af. wondering if I'm still thinking about last month. not feeling down or anything just feeling 1000% not pregnant not even been counting days or anything. just needed get it out