After having my baby when my period it's late a start to freak out, why because I'm thinking i get…

After having my baby when my period it's late a start to freak out, why because I'm thinking i get pregnant 🤰🏻😂 but it's will be late 1 or 2 days but I'm I week late and I did a pregnancy Test the 3 day I was late and it's was negative today I did another one and its negative but the come out like weird and I know how to do a pregnancy Test I did like 50 of them trying with my only baby I don't know what is going on! 😳😩