Am I pregnant?

Me and my boyfriend only use condoms, Its the only form of contraception I’ve ever used, he always cums inside me with the condom on, but sometimes if we dont have a condom he puts it in..only for like 10 seconds or so. I really dont think thats a long enough time for anything to happen, I know about pre cum, but he only ever puts it in without a condom when im not in my fertile days..My period is 3 days late and im terrified, i took two tests and according to them im not pregnant but im still so confused cus my period is never late😞What do i do? Im only 17 😭