feeling sick and dkdncck

So my period was supposed to come today but it hasnt and its already 4 in the evening... Im thinking i might be pregnant because my boobs are sore and i feel never and want to throw up..... What should i do????? There's only 3 more days till the month ends and i havent had my period????? its supposed to come today ??? Should i test😱😱😱😱