please help ...

I am 15 and scared I might be pregnant - I'm very aware and mature about what happens and not exhagerating . I had unprotected sex for the first time about two and a half weeks ago . ( I'm not asking for your lectures about safe sex and waiting and blah blah i know 🙄) I should've had my period 4 days ago and my nipples have been very sore but still no signs of period . I want to get a pregnancy test but I have very very bad anxiety and would be scared as hell to buy one - obviously not gonna ask my mom because she will beat me lol . So my only option is for my boyfriend to buy it for me but idk im scared to tell him .I'm very scared and just need advice about anything . Thank you loves..🤕💞