What i should do?

Hello everyone, this might be too much info but i need an opinion so i had unprotected sex several times but he never came inside. Today is my 3 day of my period and is missing i am 3 days late!! i have been relaxed not thinking about it but i have never been late and it keeps me wondering what i should do, should i take a test or is it too early?. I have been nauseous,tired,moody,sensitive and with cramps but they go and then they come back its not the type of cramp you have all day... thanks