Could i be pregnant?

So my and boyfriend were uk trying stuff out for the first time and well idk he might have gotten cum on his finger and then he slowly started going in my vagina for the first time. He didn’t go all the way in, just like the tip of the finger and well now im scared that i could be pregnant but i dont think so but like my period is late by 2 days and so im just getting stressed, so if someone could like reassure me that im not or idk anything. Thank you!