I'm 7 Days Late For My Period

i'm 7 days late I haven't had unprotected sex i have been using condoms 5months ago i missed my period for 4 days and my boyfriend and I thought i was pregnant but I wasn't so now he is not thaking me serious when i tell him i've missed it for 7days now he says he knows i will have my period and he says not to panic but it's 7 days late like😭😭😭😭😭😭 and i'm 16 ehat should i do!!